Our solar system now, once again, officially consists of only eight planets. Although largely debunked, speculation continued ...

Short-period comets get close to the sun much more often than their long-period kin, and every time they do, they deplete ...

Astronomers have discovered a rare planetary system that dances to a cosmic rhythm. Located 105 light-years away in the ...

It will be a while before you can see it for yourself, however. Halley’s comet was last visible from Earth in 1986, meaning ...

Halloween is upon us and the 2025 spooky season is abuzz with talk of three cosmic visitors — Comet Lemmon, Comet SWAN and the interstellar traveler 3I ATLAS — said to be haunting the night sky. But ...

Astronomer Avi Loeb outlines nine "anomalies" that he says support his hypothesis that interstellar object 3I/ATLAS is an ...

A newly discovered warp in the outer Solar System may have been created by a small, rocky world, much closer to the Sun than ...

There is no evidence to support the idea that this interstellar object is anything but a comet, but let's double-check.

Astronomers are investigating a potential hidden planet, dubbed Planet Y, far beyond Neptune. Its gravitational pull is suspected to be causing unusua ...

The comet was only discovered in January at the Mount Lemmon Survey in Arizona, making it a relatively new discovery for ...

A scientist spotted an asteroid hiding in the sun's glare that orbits the sun in just 128 days, making it the second fastest ...

Discovered in 1846 through mathematics rather than sight, Neptune was the first planet found by calculation — astronomers noticed Uranus drifting off course and predicted another world’s gravity was ...