While Jupiter's main aurora has a great deal of hot materials, a snapshot showed a cold spot in Io's auroral footprint.
Looking for a sky event this week? Check out our full Sky This Week column. March 11: Time to spot the zodiacal light Europa ...
The comet formed in a cold and distant part of the early Milky Way up to 12 billion years ago, putting it just under 2 billion years the age of the universe.