Particles carried from Earth's poles via our planet's magnetosphere could be interacting with lunar rocks to create small quantities of water on the moon.
Guide and timetable to this week's exciting events as New Horizons spacecraft encounters Pluto! Countdown on NASA TV begins 7:30 EDT (11:30 UTC) Tuesday.
Bob King - aka AstroBob - is one of the world's best space and astronomy writers. He writes for Universe Today, and his own daily blog on the night sky is a delight to read. To read Bob's latest blog on "What's up in the night sky" please go to astrobob.areavoices.com.
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