Midterm Review Puzzle

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Across
  1. 2. A plasma in hydrostatic equilibrium
  2. 7. State of matter, more energetic than gas
  3. 9. Westward motion relative to the stars
  4. 10. Human interpretation of wavelength of light
  5. 11. Charged particle of matter
  6. 12. Author of empirical model of planetary motion
  7. 13. Occurs when an electron returns to rest
  8. 15. Occurs to a photon when an atom is ionized
  9. 16. Smallest distinguishable size
  10. 17. Radiation from a hot, dense object
Down
  1. 1. Weakest fundamental force
  2. 3. Proponent of a heliocentric universe
  3. 4. Process of generating heavier atoms from lighter ones
  4. 5. Cycles per second
  5. 6. Low frequency part of the EM spectrum
  6. 8. Neutral particle of matter, defined by number of protons
  7. 14. State of matter, involved in first stage of core accretion
  8. 15. A change in speed and/or direction