What do you call an object that has all the characteristics of a moon, but whose mass compares to that of a giant planet? The ...

SpaceX is no longer content with using rockets to launch satellites that beam internet back to Earth. The company now wants ...

From Mercury’s rare appearance to NASA’s Artemis II launch window, here’s everything to watch in the skies this month.

California stargazers can observe a parade of six planets in the night sky throughout February, but the best time to see the ...

Astronomers are closing in on what looks like a rare prize: a world almost the size of Earth, circling a Sun-like star at a ...

Jupiter’s swirling storms have concealed its true makeup for centuries, but a new model is finally peeling back the clouds.

A bus-size asteroid is racing through space on a trajectory that will bring it close to Earth, and NASA is watching it with ...

Astronomers are closing in on what looks like a colossal missing piece of the Solar System, a giant planet that appears to ...

Astronomers have found thousands of exoplanets around single stars, but few around binary stars—even though both types of stars are equally common. Physicists can now explain the dearth.

Using data collected by NASA's Parker Solar Probe during its closest approach to the sun, a University of Arizona-led ...

Low Earth orbit is no longer a quiet frontier. With thousands of commercial spacecraft circling just a few hundred kilometers ...