Need a refresher about 3I/ATLAS? Here's everything to know about the interstellar object, including when the latest ...

Since its discovery, astronomers have been frantically trying to gather as much information as they can about the newest interstellar interloper dubbed 3I/ATLAS. It's been challenging, but they've ...

Amir Siraj and team propose Planet Y, a possible unseen planet influencing Kuiper Belt object orbits. Vera C. Rubin ...

The interstellar object hurtling toward the inner solar system, where Earth is located, is much larger than previously thought, astronomers say.

While Planet Y has been not yet been directly observed, unexpected inclinations found in the orbits of roughly 50 distant ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

Comet 3I/ATLAS appears to be unlike anything we've seen from interstellar space so far! Telescopes around the world are now tracking a new visitor to our celestial neighborhood. Streaking through at a ...

Our sun, currently in its prime, is expected to shine for another 5 billion years. Eventually, it will transform into a red giant, potentially engulfing inner planets. Afterward, it will become a ...

Ever since the comet 3I/Atlas was spotted, it has sparked curiosity—not just from astronomers and physicists, but from anyone who wonders whether there is something otherworldly about the mysterious ...

Astronomers have discovered fresh evidence suggesting the possible existence of an unseen planet in the far reaches of our ...

Discover the 9 rarest moons in the solar system, from Saturn’s Titan to Neptune’s Triton. Learn about their unique phases, ...