A strange planetary system called TOI-201 is changing in real time, with three very different worlds pulling on each other.

Astronomers suggest that an alternative concept of gravity, known as modified Newtonian dynamics, could explain orbital inconsistencies that have previously pointed to the existence of a ninth planet ...

AUSTIN (KXAN) — A ‘gravity hole’ on Earth? Earlier this summer, researchers with the Indian Institute of Science published a paper exploring one of these ‘gravity holes’. Found all over the planet, ...

Travel to another moon or planet and your weight will change — but not your mass. This is because your weight on other worlds depends on the gravitational force of attraction between you and that ...

Scientists reveal how waves behave on alien planets, from towering methane seas on Titan to nearly still lava oceans on ...

How do you explore the interior of a planet without ever touching down on it? Start by watching the way the planet spins, then measure how your spacecraft orbits it — very, very carefully. This is ...