Day 7

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Across
  1. 2. Planet that rotates on its side
  2. 4. ___'s law relates galaxy distance to recession velocity
  3. 6. Astrophotographer's camera type
  4. 8. Spin on one's axis
  5. 9. Type of universe that will expand forever
  6. 12. Orbit around a central body
  7. 14. Of our local star
  8. 16. Spectral shift indicating a galaxy is moving away
  9. 17. Season of maximum solar heating
  10. 21. The Red Planet
  11. 22. Outermost planet in our solar system
  12. 23. Study of the universe's origin and evolution
  13. 25. Measure of an orbit's deviation from circular
  14. 27. ___ craters are left by meteorites
Down
  1. 1. Solar system's innermost planet
  2. 3. Instrument that analyzes starlight by wavelength
  3. 5. ___ star (what our Sun will become)
  4. 7. Milky Way, for one
  5. 10. Icy visitors with glowing tails
  6. 11. Planet whose day is longer than its year
  7. 13. Shape of every planet's orbit
  8. 14. Explosive stellar endings
  9. 15. Solar system's largest planet
  10. 18. Earth's reflected solar illumination
  11. 19. Dense stellar remnant type
  12. 20. Like stellar nurseries in space
  13. 21. What a meteorite is while traveling through the atmosphere
  14. 24. Planet famous for its prominent rings
  15. 26. Third rock from the Sun