Across
- 5. a planet that is more than 3 times the mass of our own
- 7. The only other place in space people have walked on
- 8. how distance is measured in space
- 10. a group of stars that form an image
- 11. this planet shares its name with a chocolate bar
- 12. bright dots in the sky
- 13. the planet we are on
Down
- 1. what humans use to travel into space
- 2. something you don't have in space
- 3. a planet that orbits another star instead of the sun
- 4. something you use to look at space from earth
- 5. center of the solar system
- 6. planet with rings
- 9. person that studies space