This week, an old astronomical controversy is renewed as researchers present new evidence for a hidden "Planet X" in our ...

The solar system is our cosmic neighborhood, made up of the sun and everything that orbits it — planets, moons, asteroids, comets, and even dust and gas. The order of the planets in the solar ...

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

The unexpected 2020 collapse of the Arecibo Observatory left NASA's Goldstone Solar System Radar as the new heavy hitter when ...

A new study, however, identifies a possible candidate. A separate team of astronomers compared 1983 data from the Infrared ...

"I don't think this planet would have any of the effects on the Solar System that we think we're seeing." Related: How long ...

Is frozen water scattered in systems around other stars? Astronomers have long expected it is, partially based on previous ...

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The ongoing search for an additional planet at the solar system's edge has identified a new candidate, potentially ...

Discovered in 1930, Pluto was long considered our Solar System's ninth planet, but was unseated in 2006 after the discovery ...

Astronomers may have found a candidate for Planet Nine. This planet is beyond Neptune. The finding could be the first ...