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10. Astronomers have discovered hundreds of other__________________s that orbit other suns.

9. Galileo Galilei was a famous _________________ who used a telescope to study the night sky 400 years ago.

8. The __________________ from the Earth to the sun is about 150 kilometers

11. The planet Neptune was _______________ed in 1846. People didn’t know it existed before that time.

3. Last year, I got a __________________ as a birthday present. Now I look at the stars every night.

12. Why do people want to __________________ space? Why do they want to find out what is out there?

14. Another word for planet is “__________________”.

6. __________________ makes things fall down.

7. When I was a kid, I wanted to grow up and be an__________________ and travel in space.

5. I don’t live on the moon. I live on ________________.

4. Our __________________ has eight planets

15. Perhaps, humans will travel in __________________s to other solar systems and planets in the future

1.Animals or plants that might live on other planets are called __________________.

2. Some people believe that there might be alien life on __________________.

alien life

Earth

solar system

world

planets

astronomer

Mars

astronaut

explore

telescope

gravity

spaceships

discover

distance