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

Cones outnumber rods only in the center of the retina, which is the area of greatest density. It is also the area most heavily used by daytime, direct vision. But rods do fire during the day, ...

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

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

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

Trump’s Big Beautiful Bill adds $9.9 billion to NASA’s budget, reversing plans to cut the Space Launch System and Orion.

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.