Betelgeuse's weird recent dimming was caused by starspots that temporarily covered at least half of the red supergiant's surface, a new study suggests.
A massive star 75 million light-years from Earth vanished from the sky without a trace. Could it have become a black hoel without going supernova?
Black holes aren't supposed to produce flashes of light. But scientists think that last year, they spotted black holes doing just that.
Creatures that are inventions of the human imagination have inspired fear and wonder for thousands of years.
NASA is recognizing one of its "hidden figures" by naming its headquarters in Washington, D.C. after Mary Jackson, the first African American female engineer to work at the space agency.
A big black hole gobbled up a mystery object. It emitted no light detectable from Earth. What was it?
Space Perspective aims to send paying customers and payloads to the stratosphere in its Spaceship Neptune, a balloon-borne capsule that's scheduled to make its first test flights early next year.
A "ring of fire" solar eclipse will briefly appear in parts of Africa and Asia this weekend, and if you aren't out there in person, you can take in the spectacular show online.
An annular eclipse and the summer solstice are both happening this weekend. But don't worry, it's not the end of days.
For the past few years, the possibility of a new (and big!) planet hanging around in the far outer solar system has tantalized scientists and the public alike. Is "Planet Nine" out there or not?
How fast is this nearby black hole spinning? A new measurement offers clues that could solve the old mystery.
An experiment buried underground in Italy has turned up a mysterious result, and a never-before-seen "axion" particle seems like the most likely explanation.
Europe's Trace Gas Orbiter spotted an emerald glow in Mars' wispy atmosphere, marking the first time the phenomenon has been spotted on a world beyond Earth.
Scientists aren't sure if space junk or a meteor caused a brilliant blue fireball seen across Western Australia.
Two researchers investigated the dynamics of Saturn's churning atmosphere to figure out what sorts of planetary fluid dynamics are creating its mystifying hexagon.