The innermost planet of our solar system is now well placed for observers.

Keenan’s System is a faint pair of interacting galaxies in Ursa Major, joined by a 22,000-light-year bridge of glowing material.

Sweeping views of nebulae and dancing galaxies prove the telescope’s enormous field of view and ultra-high-res capabilities.

Venus and the Moon lie 5° apart in the predawn sky, offering a lovely naked-eye spectacle for early risers. The Moon passes ...

The innermost planets straddle nighttime, with Mercury in the evening and the greatest western elongation of Venus in the morning. Jupiter joins Mercury in early twilight for a few evenings, both ...

Today in the history of astronomy, a landmark institution in navigation, timekeeping, and astronomy is created.

Eta Cassiopeiae is a famous double star with contrasting colors. You can find it in the W-shaped constellation of the Queen ...

Today in the history of astronomy, celebrations at Stonehenge mark the summer solstice.

Serpens the Serpent is unique among the constellations because it’s separated into two parts with Ophiuchus the ...

The summer solstice occurs this year on Friday, June 20, at 10:42 P.M. EDT. After the June solstice, days will get shorter ...

#2. The Moon came from Earth. It didn’t form beside our planet, and Earth’s gravity didn’t capture it. The latest theory says ...

Today marks the start of Northern Hemisphere summer, and also offers a chance to view night-glowing clouds if you’re lucky.