Life on Mars?
Scientists from Aberdeen University think life on Mars could be possible after all.
They've taken samples from metorites from the Red Planet - and found they contain methane.
That could be used as a food source for microscopic life below the surface.
Professor John Parnell from the School of Geosciences says the results lead to even bigger possibilities.
He says there could be countless other rocky volcanic planets out there with methane - one of the building blocks of life.