Topic 1 - Solar System Review

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Across
  1. 3. There are more than 2 _____________ galaxies in the observable universe.
  2. 7. The force that keeps planets orbiting around the sun.
  3. 8. This planet is a similar size to Earth.
  4. 13. A solar system is smaller than the system it lives in called a ________.
  5. 15. The amount of Earth's that can fit into the sun (2 words, no spaces)
  6. 16. The way something seems.
  7. 19. The surface on mars contains _______ rich material.
  8. 20. Comets orbit beyond this planet.
  9. 21. This consists of a star, planets that orbit around it, dwarf planets, moons, asteroids, comets, and other smaller celestial bodies, all held together by the star's gravity (2 words, no spaces)
  10. 26. This is found between the inner and outer planets.(2 words, no spaces)
  11. 28. This grouping of planets have thick atmospheres, and low densities.(2 words, no spaces)
  12. 30. Moons orbit these celestial bodies.
  13. 31. Galaxies are made of stars, dust, objects orbiting the stars, and _______.
  14. 32. The closest planet to the sun.
  15. 34. Scientists use these to observe objects in space.
  16. 37. Another term for inner, rocky planets.
  17. 39. The celestial objects that are most easily detected by the human eye.
  18. 40. The outer planets are also known as the __________ planets.
  19. 41. The 3 types of galaxies are spiral, ______________, and elliptical.
Down
  1. 1. Which of these planets have a small solid core: Neptune, Jupiter, Venus, Saturn
  2. 2. This gas gives Neptune & Uranus their blue color.
  3. 4. This grouping of planets has large solid cores (2 words, no spaces)
  4. 5. Stars have apparent size and __________________.
  5. 6. What type of scientific investigation can be used to describe how things work
  6. 9. Comets have more elongated orbits than these space rocks.
  7. 10. The shape of elliptical galaxies.
  8. 11. The celestial body that has a trail of gas and dust.
  9. 12. True or False: The Milky Way Galaxy can be seen as a bright band of light in the night sky.
  10. 14. All planets rotate on an __________.
  11. 17. Saturn has the most visible of these, but all outer planets have them.
  12. 18. The largest planet in the solar system.
  13. 22. A meteorite is a meteor that has reached Earth's __________.
  14. 23. A space rock that has entered Earth's atmosphere.
  15. 24. The natural satellite of Earth.
  16. 25. A space rock that breaks off from an asteroid.
  17. 27. Old stars are found in this part of a galaxy.
  18. 29. True or False: Some galaxies can be seen without a telescope.
  19. 33. Inner planets have ____________ orbits than outer planets.
  20. 35. This star is closest to Earth.
  21. 36. The largest of the inner planets.
  22. 38. Many planets are named after __________ gods.