Today, the Moon’s shadow will fall across the North Atlantic, sending Greenland, Iceland, and Spain into darkness for a total solar eclipse. This will be the first Iceland has seen since 1954, and the ...

New Moon brings a total solar eclipse, while some of the U.S. sees a partial eclipse and the Perseids peak after dark.

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

As Gemini rises shortly before the Sun this morning, the planet Mercury is just over 7° due south of the constellation’s beta star, Pollux. An hour before sunrise, nearly all of Gemini has cleared the ...

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

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

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

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

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

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

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

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 ...