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.
"Conversion, fastidious Goddess, loves blood better than brick, and feasts
most subtly on the human will."
-- Virginia Woolf, "Mrs. Dalloway"