I recently saw this movie. It was great. I give it 5 stars. I am told that the science portrayed holds up pretty well. One thing I’m unsure about is the habitat atmosphere. How would you manufacture a breathable atmosphere? I can understand how the oxygen could be generated, but equally important is the other (inert) breathable gas, which would need to constitute ~ 80% of the synthesised atmosphere. Martian atmosphere is mostly CO2.

Also – any other comments about the science in the movie?

pesce.del.giorno said:

I recently saw this movie. It was great. I give it 5 stars. I am told that the science portrayed holds up pretty well. One thing I’m unsure about is the habitat atmosphere. How would you manufacture a breathable atmosphere? I can understand how the oxygen could be generated, but equally important is the other (inert) breathable gas, which would need to constitute ~ 80% of the synthesised atmosphere. Martian atmosphere is mostly CO2.

Also – any other comments about the science in the movie?

The other (inert) breathable gas is completely optional. The sensible thing would be to ignore the inert component completely, and have an artificial atmosphere of lower pressure (say 15 to 20 kPa) of pure oxygen. The lower limit on pressure would be to stop water from boiling at too low a temperature. The atmospheric pressure on Mars varies a lot, even in a single location, and is of the order of 0.5 to 1 kPa. Keeping the artificial atmosphere pressure low has the advantage of reducing the pressure-containing requirements of the habitat.

pesce.del.giorno said:

I recently saw this movie. It was great. I give it 5 stars. I am told that the science portrayed holds up pretty well. One thing I’m unsure about is the habitat atmosphere. How would you manufacture a breathable atmosphere? I can understand how the oxygen could be generated, but equally important is the other (inert) breathable gas, which would need to constitute ~ 80% of the synthesised atmosphere. Martian atmosphere is mostly CO2.

Also – any other comments about the science in the movie?

Humana can survive on a pure low pressure oxygen atmosphere. The nitrogen is just filler. It is not consumed by being breathed: you breathe out as much as your breathe in There would no need for him to generate nitrogen.

BUT since you ask nitrogen is the second most abundant gas in the Martian atmosphere so there would have been no problem obtaining it via distillation.

mollwollfumble said:

pesce.del.giorno said:

I recently saw this movie. It was great. I give it 5 stars. I am told that the science portrayed holds up pretty well. One thing I’m unsure about is the habitat atmosphere. How would you manufacture a breathable atmosphere? I can understand how the oxygen could be generated, but equally important is the other (inert) breathable gas, which would need to constitute ~ 80% of the synthesised atmosphere. Martian atmosphere is mostly CO2.

Also – any other comments about the science in the movie?

The other (inert) breathable gas is completely optional. The sensible thing would be to ignore the inert component completely, and have an artificial atmosphere of lower pressure (say 15 to 20 kPa) of pure oxygen. The lower limit on pressure would be to stop water from boiling at too low a temperature. The atmospheric pressure on Mars varies a lot, even in a single location, and is of the order of 0.5 to 1 kPa. Keeping the artificial atmosphere pressure low has the advantage of reducing the pressure-containing requirements of the habitat.

You may be interested in this comment on spacecraft atmospheres why-is-the-breathing-atmosphere-of-the-iss-a-standard-atmosphere

To summarise. The Mercury, Gemini, and all of Apollo breathing atmospheres were pure oxygen. The issues associated with a pure oxygen breathing atmosphere made NASA shift to having some nitrogen in the Skylab breathing atmosphere, but not much. The Skylab breathing air was 75% oxygen, 25% nitrogen. The Soviets switched from pure oxygen to standard 1-bar with nitrogen early on.

The three advantages of having a higher pressure atmosphere with nitrogen are: 1) Easier to put the astronauts in the rocket on Earth’s surface. 2) Smaller risk of fire. 3) At lower than 1 bar you’d use a pressure cooker.

Cool. Thanks for that. I know there are issues breathing pure O2 long term at 1 bar or higher, but they probably wouldn’t apply at lower pressures.

In the movie, the data readout gave the oxygen content in the habitat as ~ 20%, so in this case the O2 was diluted with something else. I see the N2 concentration of Martian atmosphere is about 2.7%, but atmospheric pressure is much less that Earth. Would it be difficult to distil sufficient quantities of N2 from this low pressure atmosphere? (I realise that once the required partial pressure for the habitat was achieved, it wouldn’t need to be replenished to any significant degree.)

Are there any long term health issues in existing in a low pressure habitat?

pesce.del.giorno said:

Cool. Thanks for that. I know there are issues breathing pure O2 long term at 1 bar or higher, but they probably wouldn’t apply at lower pressures.

In the movie, the data readout gave the oxygen content in the habitat as ~ 20%, so in this case the O2 was diluted with something else. I see the N2 concentration of Martian atmosphere is about 2.7%, but atmospheric pressure is much less that Earth. Would it be difficult to distil sufficient quantities of N2 from this low pressure atmosphere? (I realise that once the required partial pressure for the habitat was achieved, it wouldn’t need to be replenished to any significant degree.)

Are there any long term health issues in existing in a low pressure habitat?

PS. Haven’t seen the movie yet.

> Would it be difficult to distil sufficient quantities of N2 from this low pressure atmosphere?

I can think of two methods. The expensive one is by cooling it below -55.6 degrees C, filter off the crystalline CO2. The cheapest would be to pass the existing atmosphere over a CO2 scrubber. On Earth, one way to make a scrubber is to take limestone and heat it to release CO2 – grind what is produced and it will extract CO2 from whatever gas passes over it.Then recycle the scrubber many times by heating and then reusing. But there’s no limestone on Mars. Another way is to absorb CO2 in water, but water is precious on Mars. I personally would also sacrifice some of Mars’s oxygen in the atmosphere to react with carbon monoxide to make it safer.

Let’s check what the raw Martian atmosphere is, and what it would be like after CO2 and CO removal.
Component – Raw – Processed. (% or ppm by volume)
Carbon Dioxide (CO2) – 95.32% – 0%
Nitrogen (N2) – 2.7% – 61.8%
Argon (Ar) – 1.6% – 36.6%
Oxygen (O2) – 0.13% – 1.1% (approx)
Carbon Monoxide (CO) – 0.08% – 0%
Water (H2O) – 210 ppm – 0.48% (approx)
Nitrogen Oxide (NO) – 100 ppm – 0%
Neon (Ne) – 2.5 ppm – 57 ppm
Hydrogen-Deuterium-Oxygen (HDO) – 0.85 ppm – 19 ppm (approx)
Krypton (Kr) – 0.3 ppm – 7 ppm
Xenon (Xe) – 0.08 ppm – 2 ppm

That looks pretty harmless to me.

Just got back from seeing – Dang it’s a good movie!
They left a fair bit of stuff out from the book, but with the typical movie length they’d have to. Mars is stunning; not sure how accurate it is but beautifully rendered.

Was there nudity and explosions?

I should see if they will let me do a talk at the local cinema before the mars film to let everyone know they are wrong

venus is the place to go , one atmosphere pressure at 50km 15 – 20 C temp, better sunlight

Peak Warming Man said:

Was there nudity and explosions?

Yes to both, though not at the same time.

Mars’s atmosphere is about 100 times thinner than Earth’s. Without a “thermal blanket,” Mars can’t retain any heat energy. On average, the temperature on Mars is about minus 80 degrees F (minus 60 degrees C). In winter, near the poles temperatures can get down to minus 195 degrees F (minus 125 degrees C).

A summer day on Mars may get up to 70 degrees F (20 degrees C) near the equator, but at night the temperature can plummet to about minus 100 degrees F (minus 73 C). http://www.space.com/16907-what-is-the-temperature-of-mars.html

Peak Warming Man said:

Was there nudity and explosions?

ISIS attacks a nudist colony

Sean Bean is in it I see.

I thought that he died.

I’ll see it on DVD, eventually.

I enjoyed the book but found it implausible

> They left a fair bit of stuff out from the book, but with the typical movie length they’d have to.

There’s a book, then. Good, hope it’s not an abysmally bad book like “The abyss”. Checks web.

> Watney is impaled by an antenna … but with no way to contact Earth
Surely an antenna can be jury-rigged very easily.

> Burning hydrazine to make water.
A really expensive way to make water, and dangerous, hydrazine is toxic stuff. Better recycle ALL that water, from all three of urine feces and sweat. PS, saving some hydrazine would have solved that orbit matching problem at the end of the film.

> recover the unmanned Pathfinder lander and Sojourner rover
Sojourner wasn’t much of a traveller. It traveled only 100 metres before communication was lost. Can you spell “flat battery”.

> a tear in the canvas at one of the Hab airlocks breaches, collapsing the Hab and cannoning Watney away from it, breaking his suit visor. Watney survives and repairs the Hab, but his plants are dead.
Plants tend to be hardier than humans, most could survive a short time without air, and potatoes for example could be relatively easily regrown from either seed or from the eyes. But has he enough time?

> with no time to build a probe with a soft-landing system … 300 metres per second.
Hmm, there’s soft and there’s ‘not too hard’, 30 m/s would have been better. Depends on the mass of the craft. Surely there are some spare airbags hanging around on Earth.

> Meanwhile, an astrodynamicist named Rich Purnell has discovered a “slingshot” trajectory that could get Hermes and the Ares 3 crew back to Mars
Well duh, that’d be the first thing to check, and take less than a day to confirm as soon as the Martian got a message through. Even I could do the maths.

> a dust storm is approaching Watney’s course, potentially stranding him on the journey if the rover’s solar cells cannot recharge
Solar cells can recharge after the storm has passed, but it might take more than a couple of weeks. Also, enough light should get through the storm to keep everything from freezing up.

> Watney becomes aware of the encroaching dust storm and makes a rough measurement of the speed and direction of its movement, allowing him to go around it.
Chuckles softly to self – no chance in hell.

> Surviving a rover rollover
Fair enough.

> During launch, the canvas patch tears, slowing the liftoff and leaving the MAV on a course too far from the Hermes for Watney to be rescued.
Same problem twice. Why couldn’t the mission designers have made the “canvas” stronger?

> Slowing down to match the MAV’s velocity by blowing a hole in the Hermes front airlock with an improvised sugar-and-liquid-oxygen bomb.
Would tend to kill all those onboard. There are easier methods, such as simultaneously jumping out both airlocks with a little handheld propulsion for manoeuvring. Killing relative speed by crashing spacesuits into one another.

Surely an antenna can be jury-rigged very easily.

depends on what type it is and whether you know the formula to work out the more complex directional type.

people on mars will need really good vacuum cleaners

They wont get Gem there.

Peak Warming Man said:

They wont get Gem there.

Really? I thought it was everywhere.

> Watney is impaled by an antenna … but with no way to contact Earth
Surely an antenna can be jury-rigged very easily.

They don’t go into in the movie but from memory in the book the comm gear has extensive damage.

> Burning hydrazine to make water.
A really expensive way to make water, and dangerous, hydrazine is toxic stuff. Better recycle ALL that water, from all three of urine feces and sweat. PS, saving some hydrazine would have solved that orbit matching problem at the end of the film.

Probably not of much use, as the tanks on the ascent craft would have already been full.

> Watney becomes aware of the encroaching dust storm and makes a rough measurement of the speed and direction of its movement, allowing him to go around it.
Chuckles softly to self – no chance in hell.

It’s explained quite well in the book. It takes him a few days to work out where the worst of the storm so he can figure out which way to go. It made sense.

> During launch, the canvas patch tears, slowing the liftoff and leaving the MAV on a course too far from the Hermes for Watney to be rescued.
Same problem twice. Why couldn’t the mission designers have made the “canvas” stronger?

It was just a jury-rigged cover for the nose of the ascent craft. But not really needed in reality due to the very thin atmosphere. It was just a plot device to raise tension in the book & movie.

> Slowing down to match the MAV’s velocity by blowing a hole in the Hermes front airlock with an improvised sugar-and-liquid-oxygen bomb.
Would tend to kill all those onboard. There are easier methods, such as simultaneously jumping out both airlocks with a little handheld propulsion for manoeuvring. Killing relative speed by crashing spacesuits into one another.

The main spacecraft was quite large, small hand-held rockets would do nothing.
The rest of the crew stayed behind airlock doors, so no problems in losing a bunch of air.

ChrispenEvan said:

Surely an antenna can be jury-rigged very easily.

depends on what type it is and whether you know the formula to work out the more complex directional type.

its easy to build an antenna and frequency charts show lengths to cut

astronauts going to mars will need engineering skills, communication skills, they will also need horticultural skills, personal relationship skills,

like emotion control across the whole 74 emotions spectrum, cant have people misbehaving if they start to go mad

observation and critical thinking skills, lab skills

>>observation and critical thinking skills, lab skills

FTL.

so they’ll have these charts, will they? and how about making waveguides and horn assemblies? will they have metalwork facilities? like i said, and i have built antennas, some are easier than others.

ChrispenEvan said:

so they’ll have these charts, will they? and how about making waveguides and horn assemblies? will they have metalwork facilities? like i said, and i have built antennas, some are easier than others.

yea, they’ll just use Google mate, sent up by a wookie drone that’s no longer needed for pot plant or ISIS road work.

ChrispenEvan said:

so they’ll have these charts, will they? and how about making waveguides and horn assemblies? will they have metalwork facilities? like i said, and i have built antennas, some are easier than others.

He’d need a parabolic dish. The parabola is pretty easy to work out with a piece of paper, string, and a pencil.
If the original ones weren’t too badly damaged he could possibly beat them back into reasonable enough shape. Making one from scratch with the materials on hand would be tricky but not impossible.

then you need the feed horn. x-band is microwave.

ChrispenEvan said:

then you need the feed horn. x-band is microwave.

Yep. I think also as a plot device all the electronic comm gear outside the lab was destroyed. Dragged along by the wind or the like.

ChrispenEvan said:

so they’ll have these charts, will they? and how about making waveguides and horn assemblies? will they have metalwork facilities? like i said, and i have built antennas, some are easier than others.

If people are going to mars then yes they will need some construction and engineering facilities

they will also have robots, 3D printers, multi function tools and so on, maybe these will arrive on other mission spacecraft

some will be modular etc, designs for their equipment will be accessible to them for maintenance, mars astronaut training will be very extensive.

A set of skills is required

http://microtechfactoryservice.com/Ch7Pg5.html

much like your microwave oven. only at about 10GHz instead of 2.45GHz for the oven

I can build a log periodic array, so a wire grid-type parabolic antenna feed by a dipole would not be impossible

how are you going to connect the dipole to the transmitter?

ChrispenEvan said:

how are you going to connect the dipole to the transmitter?

Scavenge some parts out of the broken rover and/or the other EVA suits that don’t fit.

Spiny Norman said:

ChrispenEvan said:

how are you going to connect the dipole to the transmitter?

Scavenge some parts out of the broken rover and/or the other EVA suits that don’t fit.

Surely after the lessons of Apollo 13 NASA has tried to make as many parts as interchangeable as possible.

microwaves don’t like solid conductors. need a tube. the actually driven element is a piece of copper (probably) bent into a U with one end connected and the other end free. the signal from that is fed into the horn which then hits the dish and off into spaaaaace.

look up x-band antennas and feed etc. look at the images.

because microwaves are short wavelength size does matter. enormously. when you have a wavelength of 3.75 – 2.5cm a couple of mm make a difference. you can get away with being sloppy in the HF with metres to spare.

Spiny Norman said:

ChrispenEvan said:

how are you going to connect the dipole to the transmitter?

Scavenge some parts out of the broken rover and/or the other EVA suits that don’t fit.

radio signals sent or from a parabolic dish which reflects radio waves to an antenna feed to transmission line to transceiver

quite a few people on this forum can build antennas

Spiny Norman said:

Spiny Norman said:

ChrispenEvan said:

how are you going to connect the dipole to the transmitter?

Scavenge some parts out of the broken rover and/or the other EVA suits that don’t fit.

Surely after the lessons of Apollo 13 NASA has tried to make as many parts as interchangeable as possible.

It is probably in the mix but at a lower priority of design than lightness or efficiency.

CrazyNeutrino said:

Spiny Norman said:

ChrispenEvan said:

how are you going to connect the dipole to the transmitter?

Scavenge some parts out of the broken rover and/or the other EVA suits that don’t fit.

radio signals sent or from a parabolic dish which reflects radio waves to an antenna feed to transmission line to transceiver

quite a few people on this forum can build antennas

and certainly everyone on this forum could make a dipole antenna

CrazyNeutrino said:

CrazyNeutrino said:

Spiny Norman said:

Scavenge some parts out of the broken rover and/or the other EVA suits that don’t fit.

radio signals sent or from a parabolic dish which reflects radio waves to an antenna feed to transmission line to transceiver

quite a few people on this forum can build antennas

and certainly everyone on this forum could make a dipole antenna

sorry… but I’m antenatal…

a dipole in the x-band would be 1/2 wavelength so about 2cm long.

CrazyNeutrino said:

Spiny Norman said:

ChrispenEvan said:

how are you going to connect the dipole to the transmitter?

Scavenge some parts out of the broken rover and/or the other EVA suits that don’t fit.

radio signals sent or from a parabolic dish which reflects radio waves to an antenna feed to transmission line to transceiver

quite a few people on this forum can build antennas

radio signals sent to or from a parabolic dish which reflects radio waves to an antenna feed to transmission line to transceiver

fixed

other way is

Human voice/ or digital information to transceiver(transmitter/receiver) to transmission line to antenna feed to reflect off the parabolic dish and into space as radio waves.

radio waves in space reflected off the paraboilic dish into the antenna feed then into the transmission line then into the receiver radio amplifier speaker then into a pair of ears

some excellent videos on you-tube on how to make radio antennas

CrazyNeutrino said:

CrazyNeutrino said:

Spiny Norman said:

Scavenge some parts out of the broken rover and/or the other EVA suits that don’t fit.

radio signals sent or from a parabolic dish which reflects radio waves to an antenna feed to transmission line to transceiver

quite a few people on this forum can build antennas

radio signals sent to or from a parabolic dish which reflects radio waves to an antenna feed to transmission line to transceiver

fixed

other way is

Human voice/ or digital information to transceiver(transmitter/receiver) to transmission line to antenna feed to reflect off the parabolic dish and into space as radio waves.

radio waves in space reflected off the parabolic dish into the antenna feed then into the transmission line then into the receiver radio amplifier speaker then into a pair of ears

Most people on this forum already know that stuff but maybe some do not

you couldn’t make a microwave antenna CN.

ChrispenEvan said:

you couldn’t make a microwave antenna CN.

?
I googled

make a microwave antenna

About 2,120,000 results

Build a microwave antenna from household parts

How To Build A Tin Can Waveguide WiFi Antenna

Waveguides and Microwave Antennas

Easy

no. you have no idea.

ChrispenEvan said:

no. you have no idea.

I know I don’t.

space communication is usually x-band, as i’ve said before, cos this is what the ground stations on earth use. things get difficult at those frequencies. you can’t just use uhf stuff. really you can’t.

microwave “coax”. inner conductor is a tube.

CrazyNeutrino said:

ChrispenEvan said:

you couldn’t make a microwave antenna CN.

?
I googled

make a microwave antenna

About 2,120,000 results

Build a microwave antenna from household parts

How To Build A Tin Can Waveguide WiFi Antenna

Waveguides and Microwave Antennas

Easy

Sorry that first link does not work

this is what I meant to link

DIY USB Wi-Fi antenna made from a strainer

another makeshift job

How To: Make a simple WiFi Yagi antenna

CrazyNeutrino said:

How To: Make a simple WiFi Yagi antenna

it leads to this one

HOWTO: make a simple and cheap Yagi antenna for wifi applications

Stand aside people, I used to work in just this area.

read through thread

Fucked if I know, way too hard. This is why I changed into a power wallah nearly thirty years ago.

As an aside, does anyone really give a …

Stand aside people, I used to work in just this area.

read through thread

Fucked if I know, way too hard. This is why I changed into a power wallah nearly thirty years ago.

As an aside, does anyone really give a …

http://xkcd.com/466/

Waveguides

I’m going to put up an antenna and put out a signal

Yes, its an euphemism

if I were you i’d try to build something as an experiment and see what gives

wookiemeister said:

if I were you i’d try to build something as an experiment and see what gives

Check out the pictures of evolved antennas.

AwesomeO said:

wookiemeister said:

if I were you i’d try to build something as an experiment and see what gives

Check out the pictures of evolved antennas.

I’ve looked at XBee systems

looked at internet systems for regional areas, a plug and play type of situation dish to dish, using a laptop to open up software to set the thing up

I haven’t seen or know anything of the film

you’d think that NASA would have tutored anyone going there basic ways to communicate and how the comms systems work and can be adapted

bit hard to adapt x-band to “work” at other frequencies. xtals wont be available for a start.

plus all the coils, which don’t look like normal coils, and surface mount components so need reflow and all associated components.

with radio comms you need to know exactly what you are doing, you can break an antennae by trying to pump too much juice through it or trying to receive with it so i’ve been told

i’ll only look into it when I need to unless someone want to teach me antennae theory face to face

> He’d need a parabolic dish

Most spacecraft and landers these days don’t have parabolic dishes. It’s generally too difficult to keep them pointed in the right direction for starters. Curiosity doesn’t have a parabolic antenna. If directionality is needed then with a phased array and no parabola the directionality is software programmable.

> then you need the feed horn. x-band is microwave.

These days Ka-band is preferred to X-band for heavy data use. But for light use even S band is still used. GPS satellites use L band. All the following are still sometimes used: S, C, X, Ku and Ka bands (in order from lowest to highest frequency). The higher the frequency, the greater the trouble penetrating rain clouds.

MSL/Curiosity Rover communicates with all Mars-Orbiting Satellites using bog-standard UHF. It also talks to the Mars Reconnaissance Orbiter in Ka band. It communicates directly with Earth via the X band.

You’d have to do a heck of a lot of damage to a Mars surface communications system to put it totally out of action. And it’s not too difficult to hand-repair antennas of any sort.

i think people are dreaming it would be like the ww2 pows making a radio out of bits found, razor blade and pencil lead for a rectifier.

:-)

And it’s not too difficult to hand-repair antennas of any sort.

yeah, it is.

4 Russian warships launch 26 missiles against ISIS from Caspian sea

https://www.rt.com/news/317864-russian-warships-missiles-launch/

the antennae is hollow I believe, if there’s damage it would be fiddly to fix

if you had a 3D metal printer I suppose you could knock something up

feed horn. lets see you repair one of these.

and where it sits

you’d need to be trained in someway to fix antennae and have some kind of training on operation and how the comms are put together – its not something anyone can just cobble together

if the antennae get bent or snapped off its big problems

I bet all that stuff would be on a hair trigger to fail if its built like anything we use on earth

the high gain on curiosity is a patch antenna. doubt you could fix one of those on the fly.

5 gig patch antenna

ChrispenEvan said:

5 gig patch antenna

I wonder what you’d do if a big crack ran through that PCB

if your laptop mother board had a blown component where would you look first, how would you know, would you have the test equipment?

its the same thing, the components are too small and the subject too esoteric

https://sandilands.info/sgordon/communications-with-mars-curiosity

wookiemeister said:

ChrispenEvan said:

5 gig patch antenna

I wonder what you’d do if a big crack ran through that PCB

An array

wookiemeister said:

if your laptop mother board had a blown component where would you look first, how would you know, would you have the test equipment?

its the same thing, the components are too small and the subject too esoteric

There is a spare part industry

pesce.del.giorno said:

Also – any other comments about the science in the movie?

https://xkcd.com/1585/

CrazyNeutrino said:

wookiemeister said:

ChrispenEvan said:

5 gig patch antenna

I wonder what you’d do if a big crack ran through that PCB

An array

many antennae on the same board? same frequency?

CrazyNeutrino said:

wookiemeister said:

if your laptop mother board had a blown component where would you look first, how would you know, would you have the test equipment?

its the same thing, the components are too small and the subject too esoteric

There is a spare part industry

yeah but we are talking about someone stranded on another planet – spares might be lacking

mollwollfumble said:

pesce.del.giorno said:

Also – any other comments about the science in the movie?

https://xkcd.com/1585/

I don’t approve

one frequency.

yeah people are forgetting the original question. buggered antenna on mars and could we fix it with materials handy and talk to earth.

anyone going would have to thoroughly know and understand the systems they are using as a “just in case”

if the expert dies or gets seriously injured you are stuck

wookiemeister said:

CrazyNeutrino said:

wookiemeister said:

if your laptop mother board had a blown component where would you look first, how would you know, would you have the test equipment?

its the same thing, the components are too small and the subject too esoteric

There is a spare part industry

yeah but we are talking about someone stranded on another planet – spares might be lacking

So selecting tools and supplies for a mission is critical to maximize innovation, flexibility and survival

CrazyNeutrino said:

wookiemeister said:

CrazyNeutrino said:

There is a spare part industry

yeah but we are talking about someone stranded on another planet – spares might be lacking

So selecting tools and supplies for a mission is critical to maximize innovation, flexibility and survival

you might to have a decent 3D printer and some existing plans that would allow you to manufacture what you needed

fixing some thing that’s taken a knock is hard without training

buzz Aldrin had to hold his pen into a switch / circuit breaker so the lunar lander could get off the moon, they broke off the switch as they clambered around the cockpit of the lander, with the switch now broken , they were able to use a pen to hold it closed

as a purely mechanical problem that’s simple – fine

a piece of hardware with a million circuits or fine wiring sandwiched in a PCB that’s got a crack or some undefined fault with it – hard – throw it away

The daug and I went to see this today.

I had previously read the book (and had a thread on this forum relating to its strengths and flaws).

It is a very enjoyable movie. They do manage to cram in quite a bit of physics, chemistry, botany and orbital mechanics, and IT.

They actually eliminated the logical problems that I highlighted in the thread. The only thing gevthat was questionable was the intensity of the sandstorm.

The visuals were incredible. Dare I say it, perfect. The stratigraphy, different landscapes, form of outcrops, aeolian sand features, the colour of the sky at various times of day, even the movement of ice clouds… it was all beautiful and authentic. I’m saying this as a serious Mars nerd who never misses a pic drop from NASA or the ESA. Just lovely.

Not quite sure why Chiwetel Ejiofor was cast as Kapoor.

• Not quite sure why Chiwetel Ejiofor was cast as Kapoor.

‘The Martian’ Slammed Over ‘White-Washing’ Asian-American Roles

“The group pointed out that in Scott’s film, his name is changed to Vincent Kapoor, and he’s played by British black actor Chiwetel Ejiofor, who says his father was “a Hindu” but that his mother was “Baptist.””

…

“This feel-good movie, which has attracted Oscar buzz, shouldn’t get any awards for casting,” said MANAA founding president Guy Aoki.

dv said:

The daug and I went to see this today.

I had previously read the book (and had a thread on this forum relating to its strengths and flaws).

It is a very enjoyable movie. They do manage to cram in quite a bit of physics, chemistry, botany and orbital mechanics, and IT.

They actually eliminated the logical problems that I highlighted in the thread. The only thing gevthat was questionable was the intensity of the sandstorm.

The visuals were incredible. Dare I say it, perfect. The stratigraphy, different landscapes, form of outcrops, aeolian sand features, the colour of the sky at various times of day, even the movement of ice clouds… it was all beautiful and authentic. I’m saying this as a serious Mars nerd who never misses a pic drop from NASA or the ESA. Just lovely.

Not quite sure why Chiwetel Ejiofor was cast as Kapoor.

They did a pretty good job with gradually diminishing Damon’s physique, presumably shot in reverse, so that by the time of his nude scene at the end he is quite thin. Also you can totally see his dick.

god, we’ll never get DA out of the movies now.

dv said:

dv said:

The daug and I went to see this today.

I had previously read the book (and had a thread on this forum relating to its strengths and flaws).

It is a very enjoyable movie. They do manage to cram in quite a bit of physics, chemistry, botany and orbital mechanics, and IT.

They actually eliminated the logical problems that I highlighted in the thread. The only thing gevthat was questionable was the intensity of the sandstorm.

The visuals were incredible. Dare I say it, perfect. The stratigraphy, different landscapes, form of outcrops, aeolian sand features, the colour of the sky at various times of day, even the movement of ice clouds… it was all beautiful and authentic. I’m saying this as a serious Mars nerd who never misses a pic drop from NASA or the ESA. Just lovely.

Not quite sure why Chiwetel Ejiofor was cast as Kapoor.

They did a pretty good job with gradually diminishing Damon’s physique, presumably shot in reverse, so that by the time of his nude scene at the end he is quite thin. Also you can totally see his dick.

I was planning on seeing this next week. Thanks guys, you’ve made Buffy a rank amateur.

jjjust moi said:

dv said:

dv said:

The daug and I went to see this today.

I had previously read the book (and had a thread on this forum relating to its strengths and flaws).

It is a very enjoyable movie. They do manage to cram in quite a bit of physics, chemistry, botany and orbital mechanics, and IT.

They actually eliminated the logical problems that I highlighted in the thread. The only thing gevthat was questionable was the intensity of the sandstorm.

The visuals were incredible. Dare I say it, perfect. The stratigraphy, different landscapes, form of outcrops, aeolian sand features, the colour of the sky at various times of day, even the movement of ice clouds… it was all beautiful and authentic. I’m saying this as a serious Mars nerd who never misses a pic drop from NASA or the ESA. Just lovely.

Not quite sure why Chiwetel Ejiofor was cast as Kapoor.

They did a pretty good job with gradually diminishing Damon’s physique, presumably shot in reverse, so that by the time of his nude scene at the end he is quite thin. Also you can totally see his dick.

I was planning on seeing this next week. Thanks guys, you’ve made Buffy a rank amateur.

In what regard?

dv said:

jjjust moi said:

dv said:

They did a pretty good job with gradually diminishing Damon’s physique, presumably shot in reverse, so that by the time of his nude scene at the end he is quite thin. Also you can totally see his dick.

I was planning on seeing this next week. Thanks guys, you’ve made Buffy a rank amateur.

In what regard?

Have never heard her talk about dick.

ChrispenEvan said:

god, we’ll never get DA out of the movies now.

That was my first thought too

dv said:

jjjust moi said:

dv said:

They did a pretty good job with gradually diminishing Damon’s physique, presumably shot in reverse, so that by the time of his nude scene at the end he is quite thin. Also you can totally see his dick.

I was planning on seeing this next week. Thanks guys, you’ve made Buffy a rank amateur.

In what regard?

Spoilers :(

jjjust moi said:

dv said:

jjjust moi said:

I was planning on seeing this next week. Thanks guys, you’ve made Buffy a rank amateur.

In what regard?

Spoilers :(

Apart from the penis shot, I haven’t spoiled anything. I have described the film’s merits without giving away any big plot points.

dv said:

jjjust moi said:

dv said:

In what regard?

Spoilers :(

Apart from the penis shot, I haven’t spoiled anything. I have described the film’s merits without giving away any big plot points.

Apart from CN making a new antenna, major sandstorms and so on, you’re all good.

jjjust moi said:

dv said:

jjjust moi said:

Spoilers :(

Apart from the penis shot, I haven’t spoiled anything. I have described the film’s merits without giving away any big plot points.

Apart from CN making a new antenna, major sandstorms and so on, you’re all good.

I didn’t say anything about an antenna.

The sandstorms are in the trailer.

jjjust moi said:

dv said:

jjjust moi said:

Spoilers :(

Apart from the penis shot, I haven’t spoiled anything. I have described the film’s merits without giving away any big plot points.

Apart from CN making a new antenna, major sandstorms and so on, you’re all good.

The’s no point in me watching it now?

Mind you, it does seem a bit weird who is seriously averse to spoilers to be reading a thread that is explicitly about discussing the science of events in this movie.

dv said:

Mind you, it does seem a bit weird who is seriously averse to spoilers to be reading a thread that is explicitly about discussing the science of events in this movie.

I don’t actually care. I’ll see it if it pops up on TV before I die.

roughbarked said:

dv said:

Mind you, it does seem a bit weird who is seriously averse to spoilers to be reading a thread that is explicitly about discussing the science of events in this movie.

I don’t actually care. I’ll see it if it pops up on TV before I die.

I would reckon this is one you want to see on the big screen

roughbarked said:

dv said:

Mind you, it does seem a bit weird who is seriously averse to spoilers to be reading a thread that is explicitly about discussing the science of events in this movie.

I don’t actually care. I’ll see it if it pops up on TV before I die.

Same. Or Netflix. I won’t go to the movies here in the states.

dv said:

roughbarked said:

dv said:

Mind you, it does seem a bit weird who is seriously averse to spoilers to be reading a thread that is explicitly about discussing the science of events in this movie.

I don’t actually care. I’ll see it if it pops up on TV before I die.

I would reckon this is one you want to see on the big screen

I need to maybe get my work schedules better organized for that. When I get free time it is collapse on the lounge and the tea I was cooking burns.

kii said:

roughbarked said:

dv said:

Mind you, it does seem a bit weird who is seriously averse to spoilers to be reading a thread that is explicitly about discussing the science of events in this movie.

I don’t actually care. I’ll see it if it pops up on TV before I die.

Same. Or Netflix. I won’t go to the movies here in the states.

Yeah but you have reasons.

None of us here, you hear? Go to the movies wearing police assistant uniforms.

I went and had a look at the movie and thoroughly enjoyed it.

Thanks to p.d.g, Bil, and dv for the recommendation.

I agree with what others had to say about the science shortfalls… the antenna/transmitter problem I thought was feasible.

I might add… They should have been aware of the approaching dust storm from radar or satellite imagery.

…The red filter was applied way too heavily.

And Sean Bean does not die.

Oh yes… Disco and ABBA for a sound track.. FFS

(although it was used as a running joke)

https://vine.co/v/eQEEFK3aIWr