Across
- 2. the force that holds the planets in orbit
- 5. amount of matter, stays constant in any location
- 8. a star's luminosity, size & temp.
- 10. used to study things and make predictions
- 13. the avg. distance from the sun to Earth
- 16. large loops that explode from the sun
- 17. a collection of dust, gas, and billions of stars
Down
- 1. longest wavelength, lowest frequency
- 3. shortest wavelength, highest frequency
- 4. range of radiation, moves at speed of light
- 6. the brightness of a star from Earth
- 7. its temperature determines its color
- 9. the distance light travels in one year
- 10. spiral shaped, contains billions of stars
- 11. darker, cooler areas on the sun
- 12. the smallest portion of the EM Spectrum
- 14. the pull of gravity on mass, depends on location
- 15. tool used to view objects very far away