Earth Science - Lessons 1 & 2

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Across
  1. 2. Your point of view to tell if something is moving
  2. 3. The force that pulls on things and holds them together
  3. 5. Scientists who study outer space
  4. 8. Our closest neighboring galaxy
  5. 11. Word that describes Earth's spin
  6. 13. 671 million mph is the speed of this
  7. 14. The zone in any solar system where life could be possible
  8. 16. Earth's invisible shield that protects us from the Sun's high-energy particles
  9. 19. Everything that exists, including all space, time, matter, and energy
  10. 20. The name of our galaxy
  11. 21. a group of billions of stars, planets, dust, and gas all moving together
  12. 22. What scientists call the universe
  13. 23. Everything we as humans have been able to see and observe so far
Down
  1. 1. The point where the Earth seems to meet the sky
  2. 4. Referring to planets with a rocky, solid surface
  3. 6. The sun and everything that travels around it
  4. 7. Galaxy shape that is an elongated sphere and is brightest at its center
  5. 9. What it's called when the Earth travels around the sun
  6. 10. These are caused by the tilt of the Earth
  7. 12. Galaxy shape that doesn't fit into the other categories
  8. 15. Nickname for Earth
  9. 17. The imaginary line that divides the Earth into Northern and Southern hemispheres
  10. 18. Galaxy shape that has a bright center but also has "arms" that swing out from the center, most common galaxy shape