Focus On Physical Science: California Grade 8

Lesson 1: Structure of the Solar System

Standards Check

1.
How many planets are in our solar system? 2.g
A)eight
B)nine
C)ten
D)unknown
2.
What happened to the dust and gas that did not contribute to forming the Sun? 2.g
A)It created other stars.
B)It was lost forever.
C)It created the planets.
D)It was all burned up by the Sun.
3.
One astronomical unit is approximately equal to __________. 4.c
A)250 million km
B)75 million km
C)the distance from Pluto to the sun
D)the distance from Earth to the Sun
4.
Why do planets closer to the Sun orbit the Sun faster than planets farther away do? 2.g
A)because of the way the planets are lined up with each other in space
B)because of their size
C)because of each planet's individual gravitational pull
D)because of the Sun's gravity
5.
One orbit of Earth around the Sun is called a(n)__________. 4.e
A)spin
B)rotation
C)revolution
D)orbit
Grade 8
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