Planetary Science Crossword

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