The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

New research shows that star activity can distort exoplanet measurements, affecting size, temperature, and atmosphere ...

Kepler was one of the most successful exoplanet-hunting missions so far. It discovered 2,600 confirmed exoplanets—almost half of the total—in its almost 10 years of operation. However, most data ...

Temperamental' stars that brighten and dim over a matter of hours or days may be distorting our view of thousands of distant planets, suggests a new study.

Stargazers will be treated to a dazzling six- and seven-planet "alignments" in February. A planetary alignment, or a "planet ...

With each passing night as, the crescent slowly widens and it begins to appear against a progressively darker background, its ...

Four of those planets are close enough, large enough, and bright enough to see with the naked eye. Venus and Jupiter are particularly bright and stand out against the background stars. The most ...

Matt Champlin/Getty The stars and planets are really aligning in January. Skygazers and astronomy enthusiasts can look forward to catching a rare "planet parade" in the night sky through January.

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