The Universe

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Across
  1. 2. a small packet of light energy.
  2. 4. Jupiter, Saturn, Uranus, Neptune.
  3. 5. the region of the sun that radiates energy to space, or the visible surface of the sun.
  4. 6. a telescope that reflects light off a concave mirror, focusing the image in front of the mirror.
  5. 9. a dark spot on the sun that is cool in contrast to the surrounding photosphere.
  6. 10. includes gamma rays, X-rays, ultraviolet light, visible light, infrared radiation, microwaves, and radio waves.
  7. 11. Mercury, Venus, Earth and Mars.
Down
  1. 1. the apparent change in frequency of electromagnetic or sound waves caused by the relative motions of the source and the observer.
  2. 3. the study of the properties of light that depend on wavelength.
  3. 7. a telescope that uses a lens to bend or refract light.
  4. 8. the outer, weak layer of the solar atmosphere.
  5. 12. a cloud of gas and/or dust in space.