Rogue planets may have more in common with stars like our sun than astronomers realized. About 620 light-years from Earth, a ...

Gauging the mass of a black hole is tricky, but astronomers have devised multiple methods to measure the heft of these ...

In a recent piece for my column The Universe, I wrote about the biggest black holes in the cosmos. Black holes are rather famous for being, well, black because they can gobble down even light itself.

Harvard astrophysicist Avi Loeb suggests interstellar object 3I/ATLAS could be far more massive than previously thought.

The formation of Mercury remains an unsolved mystery. The planet closest to the sun has a disproportionately large metallic ...

One of the most powerful black holes in the universe is belching out gas at speeds of up to 10,000 kilometers per second, ...

In the 30 years since the discovery of 51 Pegasi b, more than 6,000 planets outside our Solar System have been catalogued. Two modern-day explorers explain how.

The audience re-beams at the performers because it’s all so attractively cheerful. Want to unlock unlimited news? Read more ...

Kinetic energy has to do with the motion of an object—the faster it’s moving, the more kinetic energy it has. If you take a ...

General relativity, our best theory of gravity, predicts that mass bends light. In gravitational lensing, light from a distant object is deflected by an intervening galaxy or cluster of galaxies. By ...

The 3I/ATLAS interstellar object, detected by NASA, is remarkably larger and more massive than earlier estimates, making it ...

A supermassive black hole in the far reaches of the Universe has been found guzzling down material at one of the fastest ...