And this is where our small green sandstone rock comes into the story. Those mid-Pliocene sea-levels imply the West Antarctic Ice Sheet, or at least significant parts of it, had melted away - and ...

Every now and then, one of the robots on Mars sends back a picture of an unusual rock it has found on its journeys. After all, that's one of the reasons we sent them there. The rover is equipped ...

To see what lies inside the rock, Perseverance made an abrasion patch five centimetres in diameter in a outcrop named "Wallace Butte." The large green spot lies in the upper left portion of the ...