Water, water, everywhere – where to drink in the solar system
Monday, August 24, 2015 - 08:20
in Astronomy & Space
Science fiction movies about aliens threatening the Earth routinely ascribe them the motive of coming here to steal our resources, most often our water. This is ill thought-out, as water is actually extremely common. Any civilisation coming to our solar system in need of water (either to drink or to make rocket fuel) would be foolish to plunge all the way inwards to the Earth, from where they'd have to haul their booty back against the pull of the sun's gravity.