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

You can be part of ongoing professional stellar research through the American Association of Variable Star Observers. Here's ...

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

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

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

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

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

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.

On Sept. 19, 1959, the paper “Searching for Interstellar Communications” was published. Printed in the respected scientific journal Nature and written by Cornell University physicists Giuseppe Cocconi ...

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 ...

First Quarter Moon occurs at 4:44 P.M. EDT. The Moon then reaches apogee, the farthest point from Earth in its orbit, at 11 P.M. EDT. At that time, our satellite will be 251,171 miles (404,221 ...