See the full advent calendar here, where a new image will be revealed each day until December 25.

Space scientists have marked the changing of the seasons with some striking cosmic wonders. NASA’s Chandra X-ray Observatory ...

Later in December, the 3I/ATLAS interstellar comet will get as close to Earth as it ever will. Here's what to know.

NASA’s Chandra X-ray Observatory wanted to wave goodbye to autumn by releasing images of celestial spectacles.

The asteroid Bennu continues to provide new clues to scientists' biggest questions about the formation of the early solar ...

The Full moon, the Yule Moon, is on December 4. This is a supermoon, the second largest of 2025. The next evening, the moon ...

Here’s everything you need to know about astrophotography in December 2025: ...