The Planets

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Across
  1. 3. This planet's existence was predicted before it was observed because of Uranus's orbit.
  2. 8. When ____ 2 spacecraft flew near this planet, we found out it has dark, small rings.
  3. 10. The point in an elliptical orbit that is farthest from the orbited object
  4. 11. The largest moon of Neptune's 13 moons
  5. 16. An object that IS NOT a planet may be rectangular in shape. (TRUE or FALSE)
  6. 17. This planet is more than 70% of the entire ____ mass in the solar system.
  7. 19. All ____ planets have rings.
  8. 20. The ice giant planets are found just past this planet
  9. 22. What planet is the smallest in the solar system?
  10. 27. An event caused by gravity where matter continuously comes together to gradually form a larger body of matter
  11. 28. Venus is the _____ planet in the solar system
  12. 32. An object that is in our solar system but not a planet.
  13. 33. ____ axis is used to calculate the orbit's size by measuring this length.
  14. 34. Certain ____ impacts on Mercury may be as old as the planet itself.
  15. 35. Mars's ___ color comes from iron oxide.
  16. 37. This planet's blue color comes from large amounts of ____ that reflects blue light!
  17. 38. When a star periodically ____, this tells astronomers that it is part of a planetary system.
  18. 40. A large object that is nearly spherical, orbits the Sun, and has no other objects of comparable size in its orbit.
  19. 41. Mars has a ____ surface that you can firmly stand on.
  20. 42. This planet experiences bright ____ just like Earth does even though it is so far away from the Sun.
  21. 45. This planet has shown evidence of ongoing ______ motion.
Down
  1. 1. _____ resides in the outer region of the solar system.
  2. 2. Venus is known for having an atmosphere that creates a _____ effect similar to that found on Earth.
  3. 4. A thick atmosphere with retrograde motion (clockwise spin)
  4. 5. _____ and helium make up most of Jupiter's gases and form into colorful bands.
  5. 6. This planet rotates on its side!
  6. 7. Planet-wide ___ storms engulf this planet once every 5 years.
  7. 9. Include the two planets Uranus and Neptune and temperatures drastically drop
  8. 12. _____ has only 10 hours in each day. That means it has a rapid rotation.
  9. 13. Visible bands, clouds, and rings with 13 moons
  10. 14. If we are able to populate Mars, humans born on Mars will be known as ____.
  11. 15. This planet has more than 60 moons, the largest is ___.
  12. 18. A planet that orbits a star outside the solar system.
  13. 21. _____ can exist as a solid, liquid, or gas because Earth is an ideal distance and temperature from the Sun.
  14. 23. Venus' ___ motion hypothesis is that a collision happened and caused it to flip upside down creating a clockwise rotation.
  15. 24. Both Jupiter and Saturn have ____.
  16. 25. Jupiter is the ______ largest planet in the solar system
  17. 26. Densest planet in the solar system
  18. 29. All planets _____ the Sun.
  19. 30. Both Earth and Venus show evidence of _____ activity.
  20. 31. The areas around planets' orbits are generally free of _____.
  21. 36. ____ 3rd law states that the square of the orbital period (P) is proportional to the cube of the semimajor axis (A).
  22. 39. _____ resides in the inner region of the solar system.
  23. 40. In order for _____ to be reclassified, it needs the ability to clear its orbital path of debris by gravitational pull.
  24. 43. The most famous ____ on this planet is called the Great Red Spot!
  25. 44. This planet has ___ ___ just like on Earth that grow and shrink.