4th Grade-Ch 18 Lesson 1 What makes up the universe

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  • 1. Ch. 18 Lesson 1 What makes up the universe?
  • 2. universe
    • all of space & everything in it
  • 3. galaxy
    • system of dust, gas & millions of stars held together by gravity
  • 4. What galaxy do we live in?
  • 5.  
  • 6. astronomy
    • study of Sun, Moon, stars & other objects in space
  • 7. solar system
    • Sun, planets, their moons, etc.
      • all revolve around Sun
  • 8. Inv. 1 What is the Solar System Made of ? Ch. 2
  • 9. asteroid belt
    • group of asteroids located between inner & outer planets
  • 10.  
  • 11. asteroid
    • rocky object that orbits the Sun
    • too small to be considered a planet
  • 12.  
  • 13. The Asteroid Belt [03:21]
  • 14. planet star
  • 15.
    • medium-sized star
    • largest object in our solar system
    • magnetic field
  • 16. If the Sun were hollow, we could fit one million Earth-sized planets inside of it!
  • 17.  
  • 18. The sun’s gravity is the most powerful force in the solar system because the sun’s mass is so large. 99.8 % of the mass of the solar system is in the sun.
  • 19. Time to review
  • 20. universe
    • all of space & everything in it
  • 21. asteroid
    • rocky object that orbits the Sun
    • too small to be considered a planet
  • 22.
    • is a ____-sized
    • star.
    medium
  • 23. asteroid belt
    • group of asteroids located between inner & outer planets
  • 24. astronomy
    • study of Sun, Moon, stars & other objects in space
  • 25. galaxy
    • system of dust, gas & millions of stars held together by gravity
  • 26. What galaxy do we live in?
  • 27.  
  • 28.
    • largest body in our solar system