If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

The moon will rise with Venus and the ice giant Neptune in the pre-dawn sky on Thursday, May 22.

Scientists may have just spotted Planet Nine — a massive object orbiting 700 AU from the Sun. Data from two space telescopes ...

Researchers say they found a curious dot on infrared images taken 23 years apart that seems to be moving in a manner ...

Our Solar System, a sprawling collection of planets, moons, asteroids, and comets bound together by the Sun’s gravity, has long been thought to hold hidden secrets beyond Neptune. Planet Nine ...

A team of astronomers says it has identified a single, slow-moving infrared object that checks all the right boxes for it being the long-theorized ninth planet lurking beyond Neptune. The hunt for ...

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

Apr. 15, 2025 — A new study modeled the chemistry of TOI-270 d, an exoplanet between Earth and Neptune in size, finding evidence that it could be a giant rocky planet shrouded in a thick ...

New views of TOI-421 b by JWST gives insight into how the most common type of planet in the galaxy might form.

Neptune and Uranus ... evidence that the wild idea of diamonds falling from the skies on icy planets might actually be real. Diamond rain isn’t just a wild space fact, it can also help to ...