At one point in Venus' more than 4-billion-year history as a planet, it may have had oceans filled with water on its surface.
As time went on, however, the planet — which is about as close to a twin to Earth as we'll get...
At one point in Venus' more than 4-billion-year history as a planet, it may have had oceans filled with water on its surface.
As time went on, however, the planet — which is about as close to a twin to Earth as we'll get...