Researchers now say the world may be only 5.5 days away from a serious satellite collision at any given moment, a warning that turns an abstract orbital risk into a near-term countdown. The concern is ...

Low-Earth orbit is more crowded—and fragile—than it looks. Satellites constantly weave past each other, burning fuel and ...

From cosmic collisions to which planet would make the worst roommate, no topic is out of orbit when it comes to Dr. Neil ...

Astronomers watched a distant star dim for months and found a metal-rich cloud that may be the aftermath of a massive ...

A distant Sun-like star suddenly went dark for months, stunning astronomers who quickly realized something massive was ...

Skygazers who look up at the moon tonight may be able to spot Saturn below it. Here's when and how to spot the conjunction.

"Until now, it was unknown what type of star would remain after the merger." ...

Skygazers, mark your calendars because one of the coolest celestial events is coming around again toward the end of February.

Jupiter and Saturn's different polar storms reveal clues about planet interiors: Saturn has harder bottom than Jupiter.

A decade of observations of four planets around the young planetary system V1298 Tau revealed a rare, long-sought missing link in planet formation.

Florida is home to 3 dark sky locations that may offer the clearest views of a planetary conjunction between Saturn and the ...

Discovered by volunteer scientists, this alien planet is out of synch with its siblings ...