I recently saw a movie called High Life. I thought it was a load of crap but aside from this, I think the science was faulty. It was set on a space craft, heading toward a black hole. The expedition was 8 years in. There seemed to be normal gravity on board. This was explained on the basis that the craft was constantly accelerating at the gravitational constant. A quick calculation indicates that this would result in a speed greater than the speed of light, after about a year.

Obviously it could not exceed the speed of light, but if a craft were able to accelerate indefinitely, what would be the effect felt on board as the speed of light was approached? Would it continue to feel like 1 g?

pesce.del.giorno said:

I recently saw a movie called High Life. I thought it was a load of crap but aside from this, I think the science was faulty. It was set on a space craft, heading toward a black hole. The expedition was 8 years in. There seemed to be normal gravity on board. This was explained on the basis that the craft was constantly accelerating at the gravitational constant. A quick calculation indicates that this would result in a speed greater than the speed of light, after about a year.

Obviously it could not exceed the speed of light, but if a craft were able to accelerate indefinitely, what would be the effect felt on board as the speed of light was approached? Would it continue to feel like 1 g?

You’d start to put on a bit of mass.

Peak Warming Man said:

pesce.del.giorno said:

I recently saw a movie called High Life. I thought it was a load of crap but aside from this, I think the science was faulty. It was set on a space craft, heading toward a black hole. The expedition was 8 years in. There seemed to be normal gravity on board. This was explained on the basis that the craft was constantly accelerating at the gravitational constant. A quick calculation indicates that this would result in a speed greater than the speed of light, after about a year.

Obviously it could not exceed the speed of light, but if a craft were able to accelerate indefinitely, what would be the effect felt on board as the speed of light was approached? Would it continue to feel like 1 g?

You’d start to put on a bit of mass.

relativistic mass is an outdated concept.

ChrispenEvan said:

Peak Warming Man said:

pesce.del.giorno said:

I recently saw a movie called High Life. I thought it was a load of crap but aside from this, I think the science was faulty. It was set on a space craft, heading toward a black hole. The expedition was 8 years in. There seemed to be normal gravity on board. This was explained on the basis that the craft was constantly accelerating at the gravitational constant. A quick calculation indicates that this would result in a speed greater than the speed of light, after about a year.

Obviously it could not exceed the speed of light, but if a craft were able to accelerate indefinitely, what would be the effect felt on board as the speed of light was approached? Would it continue to feel like 1 g?

You’d start to put on a bit of mass.

relativistic mass is an outdated concept.

https://www.youtube.com/watch?v=LTJauaefTZM

ChrispenEvan said:

Peak Warming Man said:

pesce.del.giorno said:

I recently saw a movie called High Life. I thought it was a load of crap but aside from this, I think the science was faulty. It was set on a space craft, heading toward a black hole. The expedition was 8 years in. There seemed to be normal gravity on board. This was explained on the basis that the craft was constantly accelerating at the gravitational constant. A quick calculation indicates that this would result in a speed greater than the speed of light, after about a year.

Obviously it could not exceed the speed of light, but if a craft were able to accelerate indefinitely, what would be the effect felt on board as the speed of light was approached? Would it continue to feel like 1 g?

You’d start to put on a bit of mass.

relativistic mass is an outdated concept.

It is?

Since when?

ChrispenEvan said:

ChrispenEvan said:

Peak Warming Man said:

You’d start to put on a bit of mass.

relativistic mass is an outdated concept.

https://www.youtube.com/watch?v=LTJauaefTZM

Thanks.

Pretty impressive bit of time travel there as well, posting the link before I asked for it.

The Rev Dodgson said:

ChrispenEvan said:

ChrispenEvan said:

relativistic mass is an outdated concept.

https://www.youtube.com/watch?v=LTJauaefTZM

Thanks.

Pretty impressive bit of time travel there as well, posting the link before I asked for it.

It is a sci fi thread.

The Rev Dodgson said:

ChrispenEvan said:

ChrispenEvan said:

relativistic mass is an outdated concept.

https://www.youtube.com/watch?v=LTJauaefTZM

Thanks.

Pretty impressive bit of time travel there as well, posting the link before I asked for it.

i knew you were going to question it.

ChrispenEvan said:

The Rev Dodgson said:

ChrispenEvan said:

https://www.youtube.com/watch?v=LTJauaefTZM

Thanks.

Pretty impressive bit of time travel there as well, posting the link before I asked for it.

i knew you were going to question it.

I blame dv.

He’s supposed to keep us up to date on this stuff.

The Rev Dodgson said:

ChrispenEvan said:

The Rev Dodgson said:

Thanks.

Pretty impressive bit of time travel there as well, posting the link before I asked for it.

i knew you were going to question it.

I blame dv.

He’s supposed to keep us up to date on this stuff.

what now?

dv said:

The Rev Dodgson said:

ChrispenEvan said:

i knew you were going to question it.

I blame dv.

He’s supposed to keep us up to date on this stuff.

what now?

It seems that only the ignorant general public and a few out-dated physicists believe in the concept of relativistic mass these days.

The Rev Dodgson said:

dv said:

The Rev Dodgson said:

I blame dv.

He’s supposed to keep us up to date on this stuff.

what now?

It seems that only the ignorant general public and a few out-dated physicists believe in the concept of relativistic mass these days.

It remains a useful concept for a lot of purposes.

pesce.del.giorno said:

I recently saw a movie called High Life. I thought it was a load of crap but aside from this, I think the science was faulty. It was set on a space craft, heading toward a black hole. The expedition was 8 years in. There seemed to be normal gravity on board. This was explained on the basis that the craft was constantly accelerating at the gravitational constant. A quick calculation indicates that this would result in a speed greater than the speed of light, after about a year.

Obviously it could not exceed the speed of light, but if a craft were able to accelerate indefinitely, what would be the effect felt on board as the speed of light was approached? Would it continue to feel like 1 g?

Back to the original question.

It depends on the power supply. Suppose the driving mechanism for the spacecraft was a laser. Then the force would remain constant as you approached the speed of light, and it would continue to feel like 1 g.

Also, because of Fitzgerald contraction, it would feel as if you’re travelling faster than the speed of light even though, to an outside observer, you are not.

Much the same thing happens on passing into a galactic mass black hole. You wouldn’t know you were inside it until you approach the singularity where space becomes not just squashed but curved.

On the other hand, if the driving force is not electromagnetic or neutrinos then the force you feel will drop off before you get close to the speed of light as the drive loses effectiveness at high sublight speeds.

So the physics in the SciFi is perfect, sorry.

mollwollfumble said:

pesce.del.giorno said:

I recently saw a movie called High Life. I thought it was a load of crap but aside from this, I think the science was faulty. It was set on a space craft, heading toward a black hole. The expedition was 8 years in. There seemed to be normal gravity on board. This was explained on the basis that the craft was constantly accelerating at the gravitational constant. A quick calculation indicates that this would result in a speed greater than the speed of light, after about a year.

Obviously it could not exceed the speed of light, but if a craft were able to accelerate indefinitely, what would be the effect felt on board as the speed of light was approached? Would it continue to feel like 1 g?

Back to the original question.

It depends on the power supply. Suppose the driving mechanism for the spacecraft was a laser. Then the force would remain constant as you approached the speed of light, and it would continue to feel like 1 g.

Also, because of Fitzgerald contraction, it would feel as if you’re travelling faster than the speed of light even though, to an outside observer, you are not.

Much the same thing happens on passing into a galactic mass black hole. You wouldn’t know you were inside it until you approach the singularity where space becomes not just squashed but curved.

On the other hand, if the driving force is not electromagnetic or neutrinos then the force you feel will drop off before you get close to the speed of light as the drive loses effectiveness at high sublight speeds.

So the physics in the SciFi is perfect, sorry.

If speed is purely relative, how can a drive lose effectiveness if it is travelling at the same speed as the thing being driven?

The Rev Dodgson said:

mollwollfumble said:

pesce.del.giorno said:

I recently saw a movie called High Life. I thought it was a load of crap but aside from this, I think the science was faulty. It was set on a space craft, heading toward a black hole. The expedition was 8 years in. There seemed to be normal gravity on board. This was explained on the basis that the craft was constantly accelerating at the gravitational constant. A quick calculation indicates that this would result in a speed greater than the speed of light, after about a year.

Obviously it could not exceed the speed of light, but if a craft were able to accelerate indefinitely, what would be the effect felt on board as the speed of light was approached? Would it continue to feel like 1 g?

Back to the original question.

It depends on the power supply. Suppose the driving mechanism for the spacecraft was a laser. Then the force would remain constant as you approached the speed of light, and it would continue to feel like 1 g.

Also, because of Fitzgerald contraction, it would feel as if you’re travelling faster than the speed of light even though, to an outside observer, you are not.

Much the same thing happens on passing into a galactic mass black hole. You wouldn’t know you were inside it until you approach the singularity where space becomes not just squashed but curved.

On the other hand, if the driving force is not electromagnetic or neutrinos then the force you feel will drop off before you get close to the speed of light as the drive loses effectiveness at high sublight speeds.

So the physics in the SciFi is perfect, sorry.

If speed is purely relative, how can a drive lose effectiveness if it is travelling at the same speed as the thing being driven?

Hmm, you may have a point there. Or not, i’m not sure.

OK thanks. So the physics is sound? A craft can accelerate indefinitely at 1g, for 8 years or more?
Crap movie anyway. There are other aspects of the physics I could gripe about.

pesce.del.giorno said:

OK thanks. So the physics is sound? A craft can accelerate indefinitely at 1g, for 8 years or more?
Crap movie anyway. There are other aspects of the physics I could gripe about.

That wasn’t the question you initially asked. You asked if on approaching light speed, a person on the craft would still feel as if they were subject to an acceleration of 1 g. They would.

Not even antimatter has enough energy to power that acceleration for that long.

mollwollfumble said:

pesce.del.giorno said:

OK thanks. So the physics is sound? A craft can accelerate indefinitely at 1g, for 8 years or more?
Crap movie anyway. There are other aspects of the physics I could gripe about.

That wasn’t the question you initially asked. You asked if on approaching light speed, a person on the craft would still feel as if they were subject to an acceleration of 1 g. They would.

Not even antimatter has enough energy to power that acceleration for that long.

to bring it down to earth though, matter does this all the time, on earth