Across
- 4. a number used to multiply one object to get another
- 6. a small object that orbits a big object
- 8. electromagnetic radiation
- 11. a large natural body that travels around the earth
- 12. an object in the night's sky that lights up and moves
- 13. a measure of the amount of matter in objects
- 14. a reign beyond neptune
- 16. this is a sphere made of mostly ice material
- 17. traveling around another object
- 18. a unit of measurement that measures the distance that light travels in a year
Down
- 1. lines up all electromagnetic based on their wavelengths
- 2. a small planet
- 3. a big circular body tat moves in an elliptical orbit around a things
- 5. and instrument used to see far away
- 6. system where are space is
- 7. the science that deals with the universe
- 9. an imaginary line about which a body rotates
- 10. it between the rocky planets and gas planets
- 15. lumps of ice , dust, and rock that circle the sun