The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Every object in our Solar System is ... km from the planet, the rings have an average thickness of only 10m. The rings are thought to be bits of comets, asteroids, or moons that broke up before ...

The next Sputnik Moment will take place against the backdrop of great power competition, as it did in the 1950s. This time, the top contenders are the U.S. and China. There are many obstacles to ...

In fact, every planet—and every moon—in the solar system will be in the sky during the eclipse. However, that doesn’t mean you’ll see them all. Contrary to what you might have read ...

Griffin Exploring the Planets Gallery probes the science and history of our exploration of planets, moons, and other objects in our solar system. This exhibit tells the stories of the diversity of ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

Extrasolar planets contextualise the Solar System among a large number of planetary systems with very different properties. Many extrasolar planets show characteristics which are not realised in the ...