Scans by spectrometers on board the Mars Express and Mars Reconnaissance Orbiters have revealed 175 outcrops in Mars's Tyrrhena Terra mountains that are unmistakably 'weathered' by water.
The rocks, found in craters, seem to have been 'carved' out from beneath the crust by asteroid impacts - and offer an insight into the planet's history, and what lies beneath the surface.
The find proves water flowed beneath the surface of Mars for a 'long period', say the researchers .... http://www.dailymail.co.uk
