Astronomers think they've found a new clue in their continuing quest to solve one of the most substantial mysteries of the cosmos: where about a third of the universe's matter is hiding.
This week, NASA made a formal request for private companies to propose future lunar technologies, with responses due by the end of next month.
Spirit and Opportunity, the Mars rovers, have done groundbreaking science on the surface of the Red Planet. Take a look at some of their latest Mars photos.
Some parts of the dwarf planet Ceres harbored pockets of near-surface water for millions of years in the recent past, a new study suggests.
NASA is launching a new research partnership to tackle the search for life beyond Earth, including life that may look very different from the kinds we're familiar with.
Earth's shadow and the Belt of Venus loom above the horizon behind the Roque de los Muchachos Observatory on La Palma in this panorama by astrophotographer Chirag Upreti.
The brilliant, blue-green comet C/2018 Y1 Iwamoto will zip by Earth this week, and the speedy space "snowball" is currently visible in the night sky with binoculars and small telescopes.