When the TESS planet hunter launched nearly 3 years ago, some 4,000 exoplanets were known. NASA confirmed in late March that TESS has discovered over 2,200 additional exoplanet candidates orbiting distant stars.

This spectacular image features spiral galaxy Messier 106 and its diminutive neighbors, as well as a dense field of background galaxies and foreground stars.

A lot, or even most, of Mars' ancient water remains trapped inside the planet's crust instead of being lost to space, according to a new study from NASA's Jet Propulsion Laboratory and Caltech.

A new theory about 'Oumuamua suggests the weird object that passed through our solar system in 2017 was a remnant of a Pluto-like world from another solar system. As one scientist said, "‘Oumuamua may be the first piece of an exoplanet brought to us."

A SpaceX rocket launched on March 4 that failed to perform a deorbit burn reentered Earth's atmosphere on March 25, 2021. It created a startling light display over Seattle and Portland.

The Event Horizon Telescope collaboration released a new image of the supermassive black hole in the center of massive galaxy M87 on March 24, 2021. The image shows the signatures of a magnetic field.

For the first time, scientists have found evidence for a secondary atmosphere on an exoplanet, created by volcanism beneath the surface. The planet, GJ 1132 b, is thought to have once been a sub-Neptune, but now is a rocky world the size of Earth.

Through 12 years of photographing and stitching together individual astrophotography images, Finnish astrophotographer J-P Mestavainio has created a 1.7 gigapixel panorama of our Milky Way galaxy.

A study here on Earth simulating the weightless conditions of space travel showed that the longer the participants were exposed to a low-gravity environment, the more they perceived facial expressions as angry.

Astronomers have discovered a restless supermassive black hole that's moving within its galaxy.