Space Science Ch26 Viewing the Universe

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Across
  1. 1. The motion of a body that travels around another body in space; one complete trip along an orbit
  2. 3. An astronomical unit for the distance that light travels in one year.
  3. 4. Rays of electromagnetic radiation with the shortest wavelength.
  4. 5. The name of the rapid expansion of space that kickstarted the universe 14 billion years ago.
  5. 7. The average distance between the Earth and the sun; approximately 150 million km.
  6. 11. The point at which the sun is as far north or as far south of the equator as possible.
  7. 12. The moment when the sun appears to cross the celestial equator.
  8. 13. The spin of a body on its axis.
Down
  1. 2. All of the frequencies or wavelengths of electromagnetic radiation.
  2. 6. A collection of stars, dust, and gas bound together by gravity.
  3. 8. Waves of electromagnetic radiation with the longest wavelength.
  4. 9. The scientific study of the universe.
  5. 10. An instrument that collects electromagnetic radiation from the sky and concentrates it for better observation.