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The Gaia space probe, launched in December 2013, has mapped more than a billion stars in the Milky Way.
Cosmic rays -- fast-moving particles that constantly pummel our planet -- come from the explosion of supernovae, new research confirmed Thursday, resolving an astronomical mystery.
The Milky Way contains at least 17 billion planets the size of Earth, and likely many more, according to a study out Monday that raises the chances of discovering a sister planet to ours.
American photographer and non-professional astronomer Nick Risinger pictured a unique panoramic view of the Milky Way in real color.