Scientists once thought luminiferous ether pervaded the cosmos. Michelson and Morley’s ingenious experiment to find it produced one of the most famous null results in astronomy.

The strange lunar swirl Reiner Gamma marks a starting point to explore several craters visible near the lunar terminator ...

Rising around 7:30 P.M. local daylight time, Saturn reaches an altitude above 40° in the southeast by local midnight. Visible ...

Discover how star clusters influence galaxy evolution and planet formation, revealed by JWST in a groundbreaking study.

The Sun passes the celestial equator moving south today, marking the Northern Hemisphere’s transition to autumn.

Our current planet-hunting techniques are unable to detect an Earth-like planet in an Earth-like orbit around a Sun-like star.

A possible Jupiter-sized object circling the brown dwarf CD-35 2722 b has implications for planetary science, including what ...

High in the eastern sky this evening you’ll find the zig-zagging constellation Lacerta, home to several lovely and relatively bright open star clusters. Tonight, let’s check out the brightest of those ...

Here's what's launching Sept. 21–27: two Chinese rockets go up, Rocket Lab delivers an Earth-observation satellite, and ...

Mars passed 6° due south of Pollux in Gemini at midnight on the 18th, and they now rise together in the early-morning sky. An hour before sunrise, the heads of Gemini have reached an altitude of ...

Now is the best time to catch 145-mile-wide 3 Juno as it passes through a random collection of 9th- and 10th-magnitude stars.