On July 13, 1969, the Soviet Union launched Luna 15, an unmanned spacecraft seen as a rival to the American Apollo 11 mission ...

Venus is notably brighter — magnitude –4.1, far outshining magnitude 0.9 Aldebaran, the brightest star in the Taurus and ...

Earth’s companion has allowed astronomers to define lunar cycles, navigate without technology, and understand celestial movements.

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.

On his first trip to the Grand Canyon Star Party, Dave Eicher joins thousands for a week of lectures, observing, and cosmic wonder.

Globular cluster M56 is a gorgeous object in Lyra the Lyre that anyone can observe with binoculars or a telescope.

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

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

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

Tonight's Full Moon, called the Bucky Moon, rises in the southeast and sets in the southwest, tracing a low path through the ...