The European Space Agency's Venus Express is helping planetary scientists investigate whether Venus once had oceans. If it did, it may even have begun its existence as a habitable planet similar to Earth.
"Everything points to there being large amounts of water on Venus in the past," says Colin Wilson, Oxford University, UK. But that does not necessarily mean there were oceans on the planet's surface. If Venus ever did possess surface water, the planet may possibly have had an early habitable phase.