So we can't see Mars in our night sky. But, more importantly for NASA, beginning this week, space engineers won't be able to risk sending commands to our fleet of spacecraft at Mars. What happens instead? Watch this video.

According to a new study by astronomers based on data from the Kepler Space Telescope, 1 in 4 sunlike stars should have a planet that's approximately Earth-sized, orbiting in the star's habitable zone.

On Earth, methane gas is often associated with microbial life. Scientists find methane in Mars' atmosphere, too. Could it be life-related? We still don't know, but a new study shows wind erosion is likely not the cause.

On August 14, gravitational wave detectors in the US and Italy sensed ripples in space-time. Data analysis suggests they came from a black hole engulfing a neutron star, 900 million light-years from Earth. If so ... it's a first-ever detection by earthly scientists.

New analyses of Saturn's rings reveal how and when they were made, from what, and whether they'll last.

For the first time, heavy metal gases like magnesium and iron have been detected floating away from an exoplanet, a planet orbiting a distant sun. Why? Because the planet - which is about as big as Jupiter - is orbiting perilously close to its star.

Arecibo in Puerto Rico was completed in 1963. In recent years, it has weathered multiple hurricanes. The emergency supplemental funds - supported by the U.S. Congress - represent an investment in the future of this large, famous and much-loved radio dish.

Following a series of successful maneuvers, India's Chandrayaan-2 spacecraft has shifted trajectories and is now on its way to the moon.

When Israel's Beresheet lunar spacecraft crashed in April 2019, there were thousands of microscopic, dehydrated tardigrades - water bears - aboard.

Hubble image of an interacting galactic duo known as UGC 2369.