Unit 2 Vocab

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Across
  1. 2. The attractive force, or pull, between objects that have mass.
  2. 3. All of outer space and the matter and objects within it.
  3. 7. Diagram, A chart that plots the surface temperatures and brightness of different classes of stars.
  4. 8. A giant ball of burning gases that gives off light.
Down
  1. 1. A system of stars, dust, and gas held together by gravity.
  2. 4. Spectrum, All of the different wavelengths of light.
  3. 5. Fusion, A process in which atoms combine, giving off huge amounts of heat and light energy.
  4. 6. A mass of dust and gases that have not pulled together to form stars.