Across
- 4. a bright streak across the sky
- 5. developed the Sun-centered theory of the universe
- 7. large, dark plains of hardened lava on the moon
- 9. Neptune and Uranus appear this color due to the methane in their atmosphere
- 10. the 2nd planet from the Sun
- 11. the phase right after the New Moon
- 14. one probe sent to the Moon to measure conditions and gather mineral samples
- 17. a meteoroid that strikes Earth
- 19. Venus & Earth both experience a __________ effect due to their atmospheres
- 22. this telescope uses clear lenses
- 23. one of these equals 1 year
- 24. the speed of _______ equals 300000 km/s
Down
- 1. large planet colored with bands of brown, red, and tan
- 2. the ______ telescope does not require light and looks like a large satellite dish
- 3. the 4th planet from the Sun
- 6. the _______________ spectrum is energy organized by wavelength
- 8. ____________ dating measures radioactive isotopes to determine the age of a rock layer
- 12. a disturbance in an established rock layer
- 13. Neil _________ was the first man on the Moon
- 15. ____________ dating compares rock layers to each other
- 16. a ______ eclipse occurs when the Moon blocks the Sun's light from reaching Earth
- 18. the season caused when part of Earth is tilted more toward the Sun
- 20. the hard, frozen part of a comet
- 21. this telescope uses curved mirrors