4th grade-ch 18 lesson 1 what makes up the universe
TRANSCRIPT
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Ch. 18Lesson 1
What makes up the universe?
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universe•all of space & everything in it
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galaxy•system of dust, gas & millions of stars held together by gravity
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What galaxy do
we live in?
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astronomy•study of Sun, Moon, stars & other objects in space
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solar system•Sun, planets, their moons, etc.
–all revolve around Sun
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Inv. 1 What is the Solar System Made of ?
Ch. 2
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asteroid belt•group of asteroids located between inner & outer planets
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asteroid•rocky object that orbits the Sun
•too small to be considered a planet
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The Asteroid Belt [03:21]
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planet star
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•medium-sized star
•largest object in our solar system
•magnetic field
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If the Sun were hollow, we could fit one million Earth-sized planets inside of it!
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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.
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universe•all of space & everything in it
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asteroid•rocky object that orbits the Sun
•too small to be considered a planet
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is a ____-sized
star.
medium
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asteroid belt•group of asteroids located between inner & outer planets
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astronomy•study of Sun, Moon, stars & other objects in space
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galaxy•system of dust, gas & millions of stars held together by gravity
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What galaxy do
we live in?
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•largest body in our solar system