From late December to mid-January, Earth moves through the streams of ... an instrument used to measure the altitude of stars above the horizon — and can be found close to Ursa Major, home ...

A super-Earth planet that dips in and out of its star's habitable zone has been discovered just 19.7 light-years away.

Look to the east and west after dark this week, and you’ll quickly see two very bright “stars” in the evening ... opposite the sun as seen from Earth. High above the east after dark each ...

Sirius, Canopus, Alpha Centauri, Arcturus, Vega, Capella, and Rigel are the seven brightest visible stars. Their varying magnitudes and distances from Earth offer insights into astronomical ...

A massive burst of gamma rays produced by the explosion of a star almost two billion light ... to 590 miles (950 kilometers) above Earth’s surface. “It was probably the brightest gamma-ray ...

NASA, in collaboration with George Mason University, is preparing to launch the Landolt NASA Space Mission, a $19.5 million initiative to place an artificial “star” in orbit by 2029.