Today in the history of astronomy, the most prolific comet-discoverer of all time gets his start.

Several planets stand still in the sky, Titan’s shadow transits Saturn, and Venus gives Taurus a second eye in the sky this ...

Algol, also known as the Demon Star, loses some 70 percent of its light every three days. It's in Perseus the Hero, now ...

At a time of turmoil and competing visions for the agency, NASA will be led by a Trump administration cabinet member.

Quasar 0957+561, the first known gravitationally lensed quasar, lies near NGC 3079 in Ursa Major. Here's how to find and ...

The author of Gemini: Stepping Stone to the Moon, The Untold Story talks about his new book.