Astronomers analyzed the vapors coming off the comet when it neared the sun and found it had a lot of "heavy" water. That ...

The farthest spacecraft from Earth has shut down another instrument in the hopes of buying time for an upgrade that could ...

"Each interstellar comet brings a little bit of its history, its fossils, from elsewhere." ...

The comet that rambled past us from another star last year likely originated in a cold, isolated corner of the galaxy that ...

We spoke to a genuine astrophysicist about the accuracy of Star Trek's approach to interstellar travel, the holodeck, and the ...

NPR's Scott Detrow talks with Regina Barber and Nell Greenfieldboyce about the Artemis moon missions, the "seismic quiet" during a solar eclipse, and the origins of a mysterious interstellar visitor.

The probe launched almost 50 years ago and is the farthest human-made object from Earth. Shutting down one of its scientific ...

Interstellar comet 3I/ATLAS is even more extreme. The ratio of semi-heavy water to regular water is 30 times larger than in ...

A comet named 3I/ATLAS was first discovered on July 1, 2025, and is located about 420 million miles away from Earth, ...

The interstellar comet 3I/ATLAS changed significantly as it flew by the sun last fall, astronomers have discovered.