Focus On Physical Science: California Grade 8

Lesson 3: Galaxies

Standards Check

1.
What are groups of stars called? 4.a
A)nebulae
B)galaxies
C)black holes
D)supernovas
2.
Why do galaxies appear to move away from each other? 4.a
A)Others move closer together.
B)Stars still are being born.
C)The universe is expanding.
D)Galaxies are spinning.
3.
What holds planets, stars, gas, and dust together in a galaxy? 4.a
A)inertia
B)friction
C)forces
D)gravity
4.
The Moon orbits Earth and Earth orbits the Sun. What does the Sun orbit? 4.c
A)the solar system
B)the universe
C)It doesn't orbit.
D)the Milky Way
Grade 8
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