Astronomy crossworld Crossword

This printable crossword puzzle on the topic of Astronomy & Space has 10 clues. Answers range from 6 to 18 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

What's the name of a space rock?
What's a group or family of stars?
What's the force holding use down in Earth?
A dust/ice ball in the Oort cloud called, "Dirty snowballs."
What is a picture made out of stars called?
What force that keeps planets in their path?
What model did Nicholas Copemicus make?
What means Earth center?
What's the name of the type of galaxy that looks like a flatted football?
What's the beginning of space and time?