For nearly a century, something unseen has tugged at the cosmos. In the 1930s, Swiss astronomer Fritz Zwicky noticed galaxies in the Coma Cluster moving as if they carried far more mass than ...

These giant radio quasars belong to a group of 369 that was recently discovered by the Giant Meterwave Radio Telescope near Pune, India.

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