ur mom's astronomy crossword puzzle

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Across
  1. 5. Mercury,Venus,Earth, Mars
  2. 6. Composed of elements heavier than hydrogen and helium; Neptune and Uranus
  3. 10. 600 million years after the Moon formed, there was a second wave of cratering on the Moon.
  4. 12. a region beyond Neptune, extending about 50 AU from the Sun
  5. 15. an enrmous aggregate of gas and dust drifting between the stars
  6. 17. Another term for "outer planets"
  7. 19. tiny dust particles where heavier elements, like carbon and oxygen, can be found.
  8. 21. what is formed when an interstellar cloud collapses; where the planets form
  9. 22. to pass in front of
  10. 23. rocky or metallic bodies
  11. 24. Jupiter, Saturn, Uranus, Neptune
  12. 25. Steep cliffs that run for hundreds of kilometers across Murcury's surface
Down
  1. 1. Giant planets made of mostly hydrogen and helium; Jupiter and Saturn
  2. 2. When a gas cools and its molecules stick together to form liquid or solid particles
  3. 3. Theory that the Solar System originated from a rotating cloud
  4. 4. Occurs when a force that acts repeatedly on a body constantly reinforces the body's motion
  5. 7. Icy bodies that enter the inner Solar System of highly elongated orbits
  6. 8. the bending of light from a distant star as the stars light travels past our sun
  7. 9. Where most comets orbit; may extend 100,000 AU from the sun
  8. 11. The component of a star's motion in the direction toward or away from Earth
  9. 13. small, planetlike bodies
  10. 14. The progression of distance from the Sun can be expressed with this mathematical relation
  11. 16. Another term for "inner planets"
  12. 18. planets from other solar systems
  13. 20. a stage of planet formation where tiny particles that condensed from the nebula begin to stick together and form bigger pieces