5.89
5.88
5.88
5.89
What is any broadly, relatively large body that revolves in an orbit around the Sun?
What is the name of the organization that is charged by the scientific community with classifying astronomical objects?
What year was Pluto last considered a planet?
How many celestrial bodies did ancient sky gazers observe against the background of the apparently fixed stars?
How many conditions must be met for a large celestial body to be considered a palanet?