Cones outnumber rods only in the center of the retina, which is the area of greatest density. It is also the area most ...

Kluger, who has written about the Apollo Program, talks about his new book: 'Gemini: Stepping Stone to the Moon, The Untold ...

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

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

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