Space

3. A terrestrial planet with a surface gravity.
5. A word what space can be called.
7. A hot glowing ball of hydrogen and helium at the center of the solar system.
11. Something an astronaut needs to have on over his head when he's out of his spaceship.
12. Two words what space can be called.
15. A planet that is made up of water, ammonia, and methane, which astromony calls "ice" or volatiles.
17. Something shiny that is a meteor that streaks across the sky.
18. A person wearing a suit in space.
20. Something that looks like a shooting star.
21. A planet with rings that is a gas giant with a radius nine times.

1. A planet with liquid surface water which is the only one to support life.
2. A planet that is called Earth's twin. It is also the hottest planet in the solar system.
4. Something an astronaut uses to fly.
6. A swirly thing that looks shiny in the middle.
7. Things an astronaut flies towards.
8. A type of hole that hails anything that goes near it.
9. Something we see shining at night that makes Earth more livable.
10. A type of rock that floats in the space.
13. A planet that is a gas giant with a diameter eleven times, and with a mass greater than 2.5 times.
14. A planet that is nicknamed the "Red Planet" because of it's orange-red surface.
16. Something an astronaut can land it's spaceship on.
19. A planet that is a gas giant made up of hydrogen, helium, and methane. It is also known as the blue giant.