The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there ...

Dwarf planet 2023 KQ14, Ammonite, has a stable orbit that challenges the hypothesis of the mysterious Planet Nine.

A composite image showing the five dwarf planets recognized by the International Astronomical Union, plus the newly discovered trans-Neptunian object 2017 OF201. The TNO is potentially large enough to ...

IMAP will launch aboard a SpaceX Falcon-9 on a mission to chart the very edge of the solar system — the heliosphere's boundary— where the Sun's influence yields to the interstellar medium.

The spacecraft will study the heliosphere, a vast bubble created by the Sun's solar wind. This bubble acts like a shield, ...

A small team led by Sihao Cheng, Martin A. and Helen Chooljian Member in the Institute for Advanced Study's School of Natural Sciences, has discovered an extraordinary trans-Neptunian object (TNO), ...