Space Crossword: Pg 440-445

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Across
  1. 2. Unmanned satellites or remote-controlled “landers”
  2. 4. Forms of radiated energy that travel at the speed of light
  3. 6. The angle between the most northerly point of the horizon and the point directly below a celestial body; also the horizontal angle or direction of a compass bearing
  4. 7. A big change in the frequency of sound, light, and other waves
  5. 9. The entire range of wavelengths for electromagnetic energy
  6. 10. The gasses and dust that exist in the space between the stars
  7. 11. The force of attraction between masses
Down
  1. 1. The distance that light travels in 1 year (approximately 9.5 trillion km); used to measure distance between stars and galaxies.
  2. 3. A telescope system that collects and analyzes radiation in the radio frequency
  3. 5. The condition in which the gravitational forces that act on a mass are greatly reduced
  4. 8. Using 2 or more telescopes to take a combined picture with a higher resolution than a singular telescope