Across
- 6. a celestial body orbiting a star.
- 8. the quantity of matter in which a body contains.
- 10. a number which scales, or multiplies, some quantity.
- 11. a celestial object made up of a nucleus of ice and dust.
- 12. the name we use to describe all the things in space.
- 13. the curved path of a celestial object or spacecraft.
- 14. a mostly spherical area that is around the Solar System.
- 16. has wavelengths longer than those of visible light.
- 17. a celestial body resembling a small planet.
- 19. an instrument made to make far objects look closer
- 20. eight planet and their moons orbiting the Sun.
Down
- 1. a place of the Solar System beyond the orbit of Neptune.
- 2. the natural satellite of the earth.
- 3. a system of millions or billions of stars.
- 4. a fixed luminous point in the night sky.
- 5. the branch of science which deals with objects in space.
- 7. a torus-shaped region in the Solar System,
- 9. an artificial body placed in orbit around a planet.
- 15. a unit of astronomical distance.
- 18. an imaginary line about which a body rotates.