The Milky-Way Crossword

This printable crossword puzzle on the topic of Astronomy & Space has 12 clues. Answers range from 4 to 20 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

How many stars are in the Milky-Way ?
How many planets are in our solar system ?
How far is the earth tilted on it's axis ?
What is the biggest planet ?
What is the hottest planet ?
What is the smallest planet in our solar system ?
What is the biggest star ?
How many times larger is the sun than the earth ?
What was formed around 4.6 billion years ago ?
Which two planets do not have any moons ?
How long does it take for mercury to orbit the sun ?
Who was the first man on the moon ?