At half the size of Earth and one-tenth its mass, Mars is a featherweight as far as planets go. Yet new research reveals the ...

Which way is ‘down’ has a different answer depending on where you are on Earth, in the solar system, in our galaxy and beyond ...

Thanks to the discovery of thousands of exoplanets to date, we know that planets bigger than Earth but smaller than Neptune ...

Astronomers have captured an exceptionally rare view of young planets in mid-transformation, revealing how bloated, giant worlds may shrink into the most common planets in the galaxy. Astronomers have ...

The star system V1298 Tau reveals that many planets begin as large, low-density worlds that slowly shrink and shed their ...

Planets usually stay close to their host stars, tracing steady paths shaped by gravity. Yet some planets break free and drift ...

GRAVITY Universe Time Clock uses magnetic levitation to create an illusion of time orbiting like a planet in space.

Learn 7 fascinating facts about Earth Rotation Day 2026 and understand how our planet’s spin affects time, seasons, and life ...

Scientists measured mass and distance of free floating planet drifting through space without star for first time.

Last time a stray planetoid the size of Mars smashed into Earth, it scattered our planet's young crust into space, where ...

Curious Kids is a series for children of all ages. If you have a question you'd like an expert to answer, send it to ...