The Solar System Crossword

This printable crossword puzzle on the topic of Astronomy & Space has 10 clues. Answers range from 3 to 19 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

How many planets are there in our solar system?
What is the third planet out from the Sun?
What is Pluto now classified as?
The asteroid belt is between Mars and which other planet?
The moon is an example of a what?
The international space station is an example of a what?
Weight is equal to mass multiplies by what?
What model of the solar system did Copernicus come up with? (The Sun at the centre)
What is the name of the model of the Universe with the Earth at the centre?
What are comets mainly made of?