Image shows Mars 4 billion years ago revealing OCEAN world – and scientists say ‘lost’ sea may still be hiding on planet

A LOST Martian ocean may be hiding beneath the red planet’s surface.

Today Mars is a cold and dry desert – but it may have been covered in rivers, lakes, and seas around four billion years ago.

NASAMars may have been a wet world with vast rivers, lakes, and seas[/caption] National Science ReviewToday Mars is a cold and dry wasteland – but it wasn’t always the case[/caption]

Even as recently as 3.1 billion years ago, it may have still had “shimmering” liquid water in large quantities.