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What is a blue moon?

What we're learning about Ultima Thule

It took 265,000 galaxies and one starry-eyed telescope to create this image

Did you miss the Eta Aquarid meteor shower? Problem solved

Astronomers discover black hole that wobbles, puffs and pulls on spacetime

What to see in the night sky in May

Auroras are a real drag on satellites, study finds

Meet 'Steve,' a strange ribbon of light that appears in the night sky

NASA's InSight lander captures intimate sights and sounds of Mars

Are SpaceX's dreams of sending humans to space on hold?

Lyrid meteor shower to peak on Earth Day