Today in the history of astronomy, Valentina Tereshkova parachutes into history books.

See two similarly bright celestial objects with different colors pair up in the evening sky.

Inflation and budget issues are threatening to hobble NASA’s most in-demand telescopes.

Astronomy interviews Sally Ride's life partner Tam O’Shaughnessy and director Cristina Costantini ahead of 'Sally' ...

Wachmann, also known as Schwassmann-Wachmann 1, glows at 13th magnitude near Leo’s forefoot early this evening.

The Whirlpool Galaxy (M51) and its smaller companion NGC 5195 are excellent targets tonight before the Moon rises.

Although the repeating cycle of sunspots was first seen in the mid-18th century, the fact that the Sun went through cycles ...

This Milky Way photographer has had many shots “ruined” by equally beautiful lights. Here are some of the best aurora images ...

June’s Full Moon is also called the Strawberry Moon, but don’t let the name fool you — it won’t be turning pink in the sky!

Today in the history of astronomy, Albert II provides invaluable physiological data, part of a long line of animal ...

ESA has just released the first-ever images taken of the Sun's south pole, as seen this year by the Solar Orbiter spacecraft.

A nearly Full Moon passes close to the ruby-red star at the heart of the Scorpion, visible in the early-morning hours.