Astronomy
Planetary Motion
Quick fact
The planets do not orbit the Sun in perfect circles, but in ellipses, with the Sun at one focus. This means Earth is slightly closer to the Sun in January than in July.
Why this is interesting
We often think the Sun rises and sets, but in reality, we are the ones moving—spinning and orbiting at tremendous speeds. What invisible force guides our planet and its neighbors on their grand journey around the Sun?