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.

The Red Planet stands less than a degree from Leo the Lion’s brightest star in the evening sky tonight, visible in the west.

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

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.

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

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

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!

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

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

Earth’s companion has allowed astronomers to define lunar cycles, navigate without technology, and understand celestial ...