Vocabulary words for Unit 2.1

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Across
  1. 3. an interstellar cloud made up of hydrogen, gas, plasma, helium gas, and dust.
  2. 4. waves of electromagnetic energy that people can see
  3. 6. Oxygen, Hydrogen, Nitrogen.
  4. 7. Our solar system is part of the Milky Way ___
  5. 9. The Earth revolves around the ____
  6. 10. Astronomers use ____ to watch the stars.
  7. 12. the distance light travels in a vacuum in one year
  8. 14. to make something appear larger, usually using one of more lenses
Down
  1. 1. Water boils at 100 degrees ____
  2. 2. having to do with the eye or lenses
  3. 5. The chemical element consisting of one proton and one electron
  4. 8. everything that exists in, on and around the Earth
  5. 11. a massive ball of gas in outer space that gives off heat, light and other forms of radiation
  6. 13. the transfer of thermal energy