Venus is set to reach dichotomy today, so take the chance to view it half-lit through a telescope in the evening sky.

A Long March 7A breaks apart less than two minutes after liftoff, and SpaceX runs its routine Starlink cadence from both coasts.

Some 1.3 billion years ago, when multicellular organisms were just emerging on Earth and life was still confined to the ocean, two behemoth black holes smashed together in a far-flung galaxy. The ...

Saturn’s two-toned moon Iapetus passes through superior conjunction, sitting just south of the ringed world this morning.

Mars and the crescent Moon hang together in the early-morning sky, straddling the border of Gemini and Taurus.

A total eclipse of the Sun coincides with the peak of the annual Perseid shower, plus Venus reaches dichotomy in the sky this ...

Astronomers refer to elements heavier than helium as metals. Metal-rich naked-eye stars include Mu Leonis, Sirius, and Alpha Centauri.

The Little Gem is a lovely blue-green planetary nebula that shines brightly in the southern sky near Sagittarius' Teapot ...

The Moon passes in front of the stars of the Pleiades, visible in the eastern U.S., while distant ice giant Uranus hangs ...

This evening, the small constellation Lacerta sits just below cross-shaped Cygnus in the eastern sky after dark. The zig-zagging outline of the Lizard lies roughly 20° east (to the lower left early in ...

Solar and lunar eclipses both occur this month, as Mars and Jupiter meet in the early morning and the Perseid meteor shower peaks.

Mercury reaches its greatest western elongation, Iapetus passes close to Saturn, and the Moon occults the Pleiades in the sky ...