Scientists studying pictures from Nasa's Odyssey spacecraft have spotted what they think may be seven caves on the surface of Mars.The researchers describe the candidate caves as "seven sisters" and have given them all names: Dena, Chloe, Wendy, Annie, Abbey, Nicki and Jeanne.
The cave entrances are between 100m and 252m wide (330-828ft).
Because in most cases the cave floors cannot be seen, only minimum depths are known: the researchers calculated they must extend between 73m and 96m (240-315ft) below the surface.
However, in one image taken of Dena by the Mars Odyssey Camera, a floor can be seen.
Using the data, the authors calculated that this cave must extend 130m (426ft) below the surface.
Link & Image: BBC
Tags: Caves | Mars
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