Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper ...

Astronomers say they have evidence that there may be a hidden planet in our Solar System. Named 'Planet Y', the Earth-sized ...

The origin of the differing tilts in the orbits of the planets in our solar system may have been revealed through the ...

Astronomers have recently detected a rogue planet entering our solar system, marking a rare event that has sparked ...

NASA is tracking a mysterious, fast-moving object entering our solar system, raising questions about whether it's just a ...

Since its fiery birth nearly 4.5 billion years ago, Mercury, the smallest planet in our solar system, has been slowly ...

Stargazers are excited as a rare planet parade is expected to happen this weekend bringing some of the main characters of our ...

Does our Solar System have 9 planets or only 8? Astronomers have gone back and forth on that a lot, with Pluto now being ...

Astronomers have discovered a brand new type of planet outside our solar system that, even in its infancy, is already bigger ...

Beyond the familiar planets lies a fascinating frontier filled with icy worlds, mysterious orbits, and cosmic curiosities.

Astronomers have discovered the earliest seeds of rocky planets forming in the gas around a baby sun-like star, providing a precious peek into the dawn of our own solar system.

All eight of the solar system’s “major” planets appear in this illustration, but the actual number of planetary bodies orbiting our star is far greater.