A seemingly ordinary asteroid has revealed its icy true identity — and new clues for spotting hidden hazards near Earth.

"Tidal disruption events help us probe the population of light supermassive black holes." When you purchase through links on ...

"Whether we want to be in the combat zone or not, orbital mechanics will put all of our space capabilities into the space war ...

Discover this week's must-see night sky events, moon phases, and stunning astrophotos. Sign up for our skywatching newsletter ...

We travel back in time with a historic "first" photo.

"Federal officials are racing to fork over America's public lands to one of wealthiest corporations on Earth before the ...

"We didn't anticipate big discoveries, given how extensively the planet has been studied, but we did complement Mars science ...

"The real challenge is that this is still an area that we don't completely understand. We get surprises now and again." ...

"The JWST allows us to observe in unprecedented detail environments that until a few years ago were beyond our reach." ...

Scientists are trying to learn how small an exoplanet with an atmosphere can be. When you purchase through links on our site, ...

Liftoff is scheduled for 6:45 p.m. ET.

The MRV-MEP mission is designed to extend the operational lives of multiple satellites in geostationary orbit.