Before Venus choked on CO2, it was habitable. What happened?
This suggests Venus may have hosted life, and opens up new ideas on where aliens may exist outside our solar system
The planet Venus may have been habitable for billions of years, Nasa scientists have calculated.
New computer models of the climate history of the second planet from the sun show that until about 700 million years ago, temperatures ranged from 20ºC to 50ºC, cool enough for liquid water.
In the 1980s, Nasa’s Pioneer Venus mission found hints that the planet once had a shallow ocean, but because it receives far more sunlight than Earth, scientists believed it had quickly evaporated before life could become established...