After reaching superior conjunction midmonth, Mercury is increasing in visibility and should be easily identifiable now in the evening sky. Just half an hour after sunset, step outside to see if you ...

Today in the history of astronomy, the man who revolutionized astronomy passes away.

Main-belt asteroid Egeria is sliding past several stationary background stars tonight, offering a chance to catch its ...

The physics behind the northern lights is just as colorful as their mythology, and we have sought to understand these lights for a long time.

Today in the history of astronomy, space weather forecasters narrowly avert nuclear war.

Slicing through the Montes Alpes mountain range, Vallis Alpes is a favorite feature to view on the First Quarter Moon.

The constellation Auriga (pronounced or-EYE-guh) the Charioteer, a star pattern known by this name for several thousand years ...

The final mission before the landmark Apollo 11, Apollo 10 served as a dress rehearsal, testing every aspect of the Moon landing except for the actual landing itself. On May 18, the crew of Commander ...

The smallest planet appears after sunset as the waxing Moon reaches First Quarter and star clusters shine in the sky this ...

Ganymede and Europa transit Jupiter tonight, while Io disappears in an occultation. West Coast observers can catch a double ...

In the Ask Astro column of the April 2026 issue is a photograph of planetary nebula NGC 6302. The caption says that NGC 6302 ...