Kenneth Chang

Dr. Tsimerman won one of four Fields Medals, an award for top mathematicians under 40, for his work on the André-Oort conjecture, but is now changing his focus to artificial intelligence.

A spacecraft meant to push NASA’s Swift Observatory to a higher orbit malfunctioned and started tumbling several days ago. Engineers think it can still succeed.

Humanity is once again littering our nearest celestial neighbor. Early on Wednesday, the discarded upper stage of a Falcon 9 rocket built by Elon Musk's SpaceX will unintentionally slam into the moon.

Although amateur and professional astronomers pointed their telescopes at the impact site, there were no obvious signs of a collision — at least not yet.

If a rocket stage crashes into the moon and no one sees it, did it really crash?

The engineers know they can only postpone the inevitable demise of the Voyagers, but they remain hopeful — and creative.

NASA's high-risk, high-reward attempt to save one of its space telescopes before it falls out of orbit has failed.

It has been decades since the heyday of the Voyagers but scientists want them to continue collecting unique observations about what lies between stars for as long as possible.

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The Nancy Grace Roman Space Telescope, scheduled to launch on Sunday, will study dark energy and discover a multitude of planets.