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 celestial motion.
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.
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 ...
Born at the same time, the star that formed Sirius B started out more massive and evolved more quickly than its companion, ...
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 ...
Venus and Jupiter are visible in the evening, while there's a conjunction of Mars and Uranus in the predawn sky.
RCW 36 boasts an open cluster of massive young stars at its heart, surrounded by glowing clouds of hydrogen gas.
In the Ask Astro column of the April 2026 issue is a photograph of planetary nebula NGC 6302. The caption says that NGC 6302 ...
In 1878, Williamina Fleming immigrated to Boston from Scotland with her husband – but he abandoned her shortly after they ...
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