Observations of the cosmic microwave background by the Atacama Cosmology Telescope in Chile suggest that the universe is 13.8 billion years old.

Solar Orbiter's new views are the closest images of the sun taken so far.

Here are 10 of the coolest, weirdest and most unexpected findings about the Pluto system scientists have learned thanks to the New Horizons spacecraft's flyby of the distant world in 2015.

A new study from researchers at Vanderbilt University suggests that to find the most massive black holes, measure the effects of their gravitational waves on the flashes of light coming from pulsars. The best location to do that is at the precise gravitational center of the solar system.

The proposed VERITAS mission to Venus is one of the finalists for NASA's Discovery Program. If selected, it will revolutionize our knowledge about the planet's geology and how this formerly habitable world became a fiery wasteland.

After more than a year in a clay-rich region, Curiosity is making a mile-long journey around some deep sand so that it can explore higher up Mount Sharp.

The Venus rover challenge - called "Exploring Hell" - received a great response from countries around the world. NASA said the design ideas submitted will help advance the final design of a mechanical rover that might one day explore the hellish surface of Venus.

The dwarf planet’s hot birth may have created a warm internal ocean, and where there's warm water, there might be life.

Researchers at Omni Calculator have created the Alien Civilization Calculator, a unique combination of two different methods of trying to determine how many advanced alien civilizations may exist in our galaxy.

There's a nice binocular comet - Comet NEOWISE - in the early morning sky now. Some experienced observers are catching it with the eye alone. It's nice ... but not great. When will we see our next great comet?