Across
- 2. an imaginary line that divides Earth into Northern and Southern Hemisphere
- 5. a massive ball of gas in outer space that gives off heat, light and other forms of radiation
- 8. everything that exists in, on and around the Earth
- 10. spinning
- 12. a group of stars
- 13. an imaginary line that an object spins or revolves around
- 15. waves of electromagnetic energy
Down
- 1. a natural or artificial object that revolves around another object in space
- 3. the study of the properties and behavior of bodies in outer space
- 4. one half a sphere
- 6. the circular path of an object as it revolves around another object
- 7. an instrument used to observe objects far away
- 9. a small planet-like body of rock that orbits a star
- 11. send energy from one place to another
- 14. a group of solar systems, dust, and gas held together by gravity