Across
- 5. A region between Mars and Jupiter which asteroids are found.
- 7. Spiral Elliptical irregular
- 11. cloud a giant spherical cloud surrounding the sun
- 12. the total amount of matter in an object
- 15. a celestial body resembling a small planet
- 16. a curved path of an object
- 17. an instrument that makes distant objects appear close
- 18. an imaginary line that runs through an object
Down
- 1. celestial object consisting of a nucleus of ice and dust
- 2. a method for reducing all measurements
- 3. a natural satellite of the Earth
- 4. a large system of stars gas, and dust
- 6. year the distance that light travels in one year
- 8. a natural or artificial that orbits other objects in space
- 9. a fixed luminous point in the sky
- 10. a branch of science
- 13. a celestial body which orbits a star
- 14. all existing matter