It might seem unfathomable to us living today, but 179 years ago on this very date, our galaxy, The Milky Way, actually grew by one planet. Okay, okay, we know, that that is not what actually happened ...

Neptune’s supersonic winds and icy storms revealed a planet so extreme that it forever changed our picture of the solar system. The discovery of Neptune in 1846 was not just the triumph of mathematics ...

Astronomers used a telescope in Hawaii to find a new object on the outer edges of our solar system, helping to fuel evidence of a long-standing theory about Planet Nine, or Planet X. For years, ...

In May 2026, SETI Institute scientists and affiliates contributed to a wide range of conversations spanning planetary science ...

A team of astronomers led by the Center for Astrophysics | Harvard & Smithsonian has discovered a rare object far beyond Neptune, from a class known as trans-Neptunian objects, that is moving in ...