Planets Crossword Puzzle

This printable crossword puzzle on the topic of Astronomy & Space has 15 clues. Answers range from 3 to 10 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

Which planet only has one moon?
Which planet has two moons?
Which planet's biggest moon is IO?
Which planet's biggest moon is Tethys?
What is the biggest moon attached to Uranus?
What is the biggest moon attached to Neptune?
Which planet has five moons?
Mercury, Venus, Earth, and Mars are all what type of planet?
Jupiter, Saturn, Uranus, and Neptune are all what type of planet?
The planets do what around the sun?
What's it called when the earth spins on it's axis?
What's it called when the earth moves around the sun?
What's the name of the asteroid we studied?
What was the name of the comet we studied?
The sun is a what?