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

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

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

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

Comets are small, roundish bodies made of dust grains mixed with ice. Most travel along elliptical orbits that occasionally ...

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

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

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

Venus and Jupiter are visible in the evening, while there's a conjunction of Mars and Uranus in the predawn sky.

Born at the same time, the star that formed Sirius B started out more massive and evolved more quickly than its companion, ...

Saturn dominates the predawn sky, while Mars is rising earlier each day. The Red Planet is still a bit challenging — can you ...

The Moon sits between bright Venus and Jupiter in the evening sky, tracing out the plane of the ecliptic for all to see.