On Oct. 3, the comet came within about 18 million miles of the Red Planet. Both China's Tianwen-1 Mars Orbiter and NASA's Mars Reconnaissance Orbiter (MRO) captured it. But while NASA's images remain ...

Is 3I/Atlas an alien spacecraft or just a really interesting rock hurling through the cosmos? That debate has been raging ...

Jared Isaacman has been renominated to lead NASA, and a document outlining his vision for the agency has been leaked to the ...

Astronomers analysing supernova and DESI data suggest dark energy—the mysterious force accelerating cosmic expansion—may be ...

The Hubble Space Telescope has captured an amazing view of galaxies LEDA 48062 and UGC 8603. Credit: ESA/Hubble & NASA, R. Tully | edited by Space.com's Steve Spaleta Music: Missing of Times by Joseph ...

As 3I/ATLAS races through our solar system, NASA and Harvard take unprecedented action to study its bizarre anti-tail and erratic motion.

The interstellar object known as 3I/ATLAS continues to draw scientific interest and online speculation, particularly after ...

A new study is implying that the universe may actually be slowing down and that the culmination of the decrease in dark ...

In L.A. to talk about a new book, the astrophysicist, author, podcaster and all-around spokesman for science has stories to ...

Astronomers may have misread cosmic acceleration for 27 years. The universe may be slowing down, not speeding up.

Evidence now suggests the universe’s expansion has started to slow, not speed up. The findings imply dark energy is weakening ...