Water ice can't persist on Mars surface in the region of Utopia Planitia, about halfway from Mars' equator to its pole. But researchers say there's water in a vast frozen lake underground.
In late November 2016, the waning moon took aim on Jupiter in the predawn sky. It swept closest to it on the morning of November 25. Photos from around the world, here.
The moon is mostly out of the sky now. Today and tomorrow we'll give you 2 different ways to locate the Andromeda galaxy, the next-nearest large spiral galaxy.
One half of the W of Cassiopeia is more deeply notched than the other half. This deeper V is your "arrow" in the sky, pointing to the Andromeda galaxy.
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