The Planets

Facebook Twitter

Bc video: Virgin Galactic prepares private space tours. The Solar System. Our solar neighborhood is an exciting place.

The Solar System

The Solar System is full of planets, moons, asteroids, comets, minor planets, and many other exciting objects. Learn about Io, the explosive moon that orbits the planet Jupiter, or explore the gigantic canyons and deserts on Mars. What Is The Solar System? Welcome to the Planets. The Nine Planets Solar System Tour. Planets. Planets: The planet count in our solar system has gone as high as 15 before new discoveries prompted a fine tuning of the definition of a planet.

Planets

The most recent change was in 2006 when scientists reclassified Pluto as a new kind of object - a dwarf planet. Your Weight on Other Worlds. Before we get into the subject of gravity and how it acts, it's important to understand the difference between weight and mass.

Your Weight on Other Worlds

We often use the terms "mass" and "weight" interchangeably in our daily speech, but to an astronomer or a physicist they are completely different things. The mass of a body is a measure of how much matter it contains. An object with mass has a quality called inertia. If you shake an object like a stone in your hand, you would notice that it takes a push to get it moving, and another push to stop it again. If the stone is at rest, it wants to remain at rest.