How do objects in space travel?
All of the planets, comets, and asteroids in the solar system are in orbit around the Sun. All of those orbits line up with each other making a kind of flat disk called the orbital plane.
The planets all orbit on or near one plane in space like the picture above. They do not orbit at all angles, as below.
What is an orbit?
What causes an orbit to happen?
What travels in an orbit?
Is there gravity in space?
What is a satellite?
What is in space?
How do asteroids orbit?
Are there orbits within orbits?
How do we know what's in space?
What are the orbital lengths and distances of objects in our solar system?