Space Crossword Puzzle

What provides light in the center of our solar system?
What color proves the star is hot and not cool?
What diagram is used to find a stars' absolute magnitude or luminosity?
What galaxy are we located in?
What is the zone that is not too hot or too cold, but just perfect?
What is the ball of rock that is orbiting around earth called?
How many minutes does it take for sun's rays to hit earth?
What measurement is used to measure distance in space?
The first man to step foot on the moon?
Which planet is not considered a planet?