Scientists may add a new dwarf planet to the official roster of our solar system. The distant, icy body, provisionally dubbed ...

Astronomers have identified a massive icy object beyond Pluto that could become one of the largest known dwarf planets in our ...

2026 ED138 joins a tribe of potential dwarf planets on the edge of our solar system — and Rubin's astronomers are likely to ...

An artist's impression of an icy world surrounded by debris in the outer Solar System. (Mark Garlick/Science Photo ...

Astronomers using the European Southern Observatory's Very Large Telescope (ESO's VLT) have found a rare disk of debris ...

As far-fetched as it may seem, quirks of orbital mechanics could allow hundreds of planets to be packed around a star ...

Astronomers have uncovered evidence of a bizarre, potentially historic discovery: the first moon ever detected beyond our ...

A powerful new tool comes online this year that could help astronomers locate the mysterious planet hiding somewhere beyond Neptune altering object orbits. If you get the question in Trivial Pursuit ...

For the first time, astronomers have detected radio signals from a planet beyond our solar system, according to a study available on the preprint server arXiv. The landmark observation offers a new ...

Add Yahoo as a preferred source to see more of our stories on Google. Dottedhippo/Getty Images On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by ...

The shape of a planet's orbit is one of its fundamental properties, along with its size and distance from its host star. Earth has a nearly circular orbit, but some planets outside our solar system, ...