The Solar System
0%Science
The Solar System
Beginner~18 min16 steps
One star holding 99.8% of the mass, and eight planets working out the rest among themselves.
You’ll learn
- Name the eight planets in order from the Sun
- Explain why inner planets orbit faster than outer ones
- Explain why the inner planets are rocky and the outer ones are gas or ice giants
- Calculate a planet's orbital period from its distance using Kepler's third law
- Use the inverse-square law to compare gravity and sunlight at different distances
- Correct the common myths about seasons, Venus, the asteroid belt and Pluto