NASA's Mars Exploration Rover Spirit captured this stunning view as the sun sank below the rim of Gusev crater on Mars.

To man’s naked eye the sun seems a smooth, bright disk. But astronomers have long known that its face is mottled with hot clouds of hydrogen gas, which seem to be the source of some of the ...

Coronal mass ejections are large clouds of ionized gas called plasma and magnetic fields that erupt from the sun’s outer atmosphere. Detailed images such ... This is something no other ...

The National Science Foundation’s Daniel K. Inouye telescope debuted a close-up of the sun captured by its new, ultra-powerful imaging tool. Here’s what you can see.