from the best-discoveries-by-accident dept.
The rover Spirit has been dragging one wheel around the surface of Mars for some time. One of the resulting gouges revealed a mineral deposit which was probably caused by a hydrothermal vent. This implies a large amount of water was present when the vent was active.
"Don't worry about people stealing your ideas. If your ideas are any good,
you'll have to ram them down people's throats."
-- Howard Aiken