Chris Cassidy is going into quarantine—but for a NASA astronaut preparing to launch to the International Space Station ... to seeing familiar faces—floating through the hatch and seeing ...

A curious cow watches as NASA astronauts Andre Douglas and Kate Rubins perform a simulated moonwalk in the San Francisco ...

NASA Odyssey orbiter snapped a first-ever image of a Mars volcano peeking above clouds before dawn. It’s twice as tall as Earth’s largest volcano.

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