Life on Earth may have started on Mars, thanks to molybdenum

The oxidised mineral form of the element molybdenum, which may be crucial to the origins of life, could only have been found on the surface of Mars at the time.

Three billion years ago the surface of Earth had little oxygen, but Mars was oxygen-rich, suggesting that life started on Mars and then came to Earth on a rock.

Read more at European Association of Geochemistry