Planetary Science Crossword

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Across
  1. 4. a day of the year when the Sun's rays shine
  2. 7. a crater that has central peaks and ejecta in long rays
  3. 11. how long it takes an object to orbit another
  4. 12. the region of the solar system beyond the orbit of Neptune
  5. 13. a bright line of a spectrum
  6. 15. the sum total of all things that can be observed or detected
  7. 19. the dark surface of cooled magma in a flooded crater
  8. 21. pertaining to the Moon
  9. 22. a layer of gases that surround an object
  10. 26. an enormous collection of tons of millions of stars
  11. 27. a chunk of ice, dust, and rock material
  12. 28. the path one object takes to travel around another object
  13. 30. a representation
  14. 32. a cloud of gas and dust in space between stars
  15. 33. the reference star pointed to by Earth's North Pol
  16. 34. the stage of a star when it has no more fuel for nuclear reactions
  17. 36. a piece of rock or metal from space
  18. 37. an object that orbits a star and is massive enough for its own gravity to force it into a spherical shape
  19. 38. an object that orbits the Sun and is big enough to be round
  20. 40. a streak of light in the sky
  21. 41. the assemblage of objects, distances, and directions
Down
  1. 1. wavelengths of electromagnetic radiation that can be seen by the human eye
  2. 2. when Earth is exactly between the Moon and the Sun
  3. 3. an imaginary axle that a planet spins on
  4. 5. a change in land created by an impact
  5. 6. a small, rocky object that orbits the sun
  6. 8. the phase of the Moon is opposite the Sun as seen from the moon
  7. 9. a Moon shape that is larger than a first or third quarter Moon
  8. 10. the remains of organisms that lived long ago
  9. 14. the name of the galaxy that our solar system is in
  10. 16. the path an object takes to travel around another object
  11. 17. each different shape of the Moon
  12. 18. a force of attraction between masses
  13. 20. the range of electromagnetic radiation arranged in order of energy level
  14. 23. earths natural satellite
  15. 24. a collection of interacting parts
  16. 25. a planet orbiting a star
  17. 29. a theory that one explosion created the universe
  18. 31. light-colored areas of the Moon with lots of rough mountains and craters
  19. 35. a region of space occupied by a system of objects orbiting a star
  20. 39. the stage of a star when it becomes very large