….until “something happened” to resurface the planet about 700 million years ago. Although it seems to me that if they have no real idea of how and why this happened, the earlier part of their story is highly speculative.

Anyway, make of it what you will:

In a new study, scientists make the case for how ancient Venus could have once supported life alongside oceans of liquid water, until a mysterious resurfacing event took all that away about 700 million years ago.

“Our hypothesis is that Venus may have had a stable climate for billions of years,” says planetary scientist Michael Way from NASA’s Goddard Institute for Space Studies.

“It is possible that the near-global resurfacing event is responsible for its transformation from an Earth-like climate to the hellish hot-house we see today.”

The research – presented last week at the EPSC-DPS Joint Meeting 2019 in Geneva, Switzerland – builds upon two previously published studies by Way and his team, and related papers modelling virtualised Venus-like worlds and topographies.

The upshot, the team says, is that 3D GCM (general circulation model) mathematical modelling supports the ‘optimistic’ view that Venus “spent most of its history with surface liquid water, plate tectonics, and subsequently a stable temperate climate akin to that of Earth through much of its own history”.

Full report

Bubblecar said:

….until “something happened” to resurface the planet about 700 million years ago. Although it seems to me that if they have no real idea of how and why this happened, the earlier part of their story is highly speculative.

Anyway, make of it what you will:

In a new study, scientists make the case for how ancient Venus could have once supported life alongside oceans of liquid water, until a mysterious resurfacing event took all that away about 700 million years ago.

“Our hypothesis is that Venus may have had a stable climate for billions of years,” says planetary scientist Michael Way from NASA’s Goddard Institute for Space Studies.

“It is possible that the near-global resurfacing event is responsible for its transformation from an Earth-like climate to the hellish hot-house we see today.”

The research – presented last week at the EPSC-DPS Joint Meeting 2019 in Geneva, Switzerland – builds upon two previously published studies by Way and his team, and related papers modelling virtualised Venus-like worlds and topographies.

The upshot, the team says, is that 3D GCM (general circulation model) mathematical modelling supports the ‘optimistic’ view that Venus “spent most of its history with surface liquid water, plate tectonics, and subsequently a stable temperate climate akin to that of Earth through much of its own history”.

Full report

Probably the Venusians couldn’t agree how to deal with climate change either.

The Rev Dodgson said:

Bubblecar said:

….until “something happened” to resurface the planet about 700 million years ago. Although it seems to me that if they have no real idea of how and why this happened, the earlier part of their story is highly speculative.

Anyway, make of it what you will:

In a new study, scientists make the case for how ancient Venus could have once supported life alongside oceans of liquid water, until a mysterious resurfacing event took all that away about 700 million years ago.

“Our hypothesis is that Venus may have had a stable climate for billions of years,” says planetary scientist Michael Way from NASA’s Goddard Institute for Space Studies.

“It is possible that the near-global resurfacing event is responsible for its transformation from an Earth-like climate to the hellish hot-house we see today.”

The research – presented last week at the EPSC-DPS Joint Meeting 2019 in Geneva, Switzerland – builds upon two previously published studies by Way and his team, and related papers modelling virtualised Venus-like worlds and topographies.

The upshot, the team says, is that 3D GCM (general circulation model) mathematical modelling supports the ‘optimistic’ view that Venus “spent most of its history with surface liquid water, plate tectonics, and subsequently a stable temperate climate akin to that of Earth through much of its own history”.

Full report

Probably the Venusians couldn’t agree how to deal with climate change either.

And wrinkled lip, and sneer of cold command,
Tell that its sculptor well those passions read
Which yet survive, stamped on these lifeless things,
The hand that mocked them and the heart that fed:
And on the pedestal these words appear:
‘FAKE NEWS’

Bubblecar said:

….until “something happened” to resurface the planet about 700 million years ago. Although it seems to me that if they have no real idea of how and why this happened, the earlier part of their story is highly speculative.

Anyway, make of it what you will:

In a new study, scientists make the case for how ancient Venus could have once supported life alongside oceans of liquid water, until a mysterious resurfacing event took all that away about 700 million years ago.

“Our hypothesis is that Venus may have had a stable climate for billions of years,” says planetary scientist Michael Way from NASA’s Goddard Institute for Space Studies.

“It is possible that the near-global resurfacing event is responsible for its transformation from an Earth-like climate to the hellish hot-house we see today.”

The research – presented last week at the EPSC-DPS Joint Meeting 2019 in Geneva, Switzerland – builds upon two previously published studies by Way and his team, and related papers modelling virtualised Venus-like worlds and topographies.

The upshot, the team says, is that 3D GCM (general circulation model) mathematical modelling supports the ‘optimistic’ view that Venus “spent most of its history with surface liquid water, plate tectonics, and subsequently a stable temperate climate akin to that of Earth through much of its own history”.

Full report

“Something happened on Venus where a huge amount of gas was released into the atmosphere and couldn’t be re-absorbed by the rocks. On Earth we have some examples of large-scale outgassing, for instance the creation of the Siberian Traps 500 million years ago which is linked to a mass extinction, but nothing on this scale. It completely transformed Venus.”

Flood basalt again. Dangerous stuff.

There’s no doubt that Venus atmosphere is a secondary atmosphere, formed almost solely by outgassing from the crust, as are the atmospheres of both Earth and Mars. The general consensus is that this wouldn’t have occurred more recently than Late Heavy Bombardment, 3.8 billion years ago, and may have been more like 4.5 billion years ago.

There may have been a more recent resurfacing, but I strongly suspect that evidence for it is so far completely lacking. And even it there was, resurfacing events were probably more frequent earlier when the planet’s core was hotter.

A sample return mission, to measure the age of Venus’s rocks, is needed.