Inspire Science Unit 4b Lesson 1 (Earth's Place in Space)

Which of the following describes a planet?

• a swirling ball of gases

• a star

• a huge ball made out of rock

• a large object that orbits a star

How long does it take Earth to complete one revolution around the Sun?

• one day

• one week

• one month

• one year

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Planets revolve around the Sun in an ________ orbit.

• circular

• elliptical

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A _____ contains billions of stars, dust, and gas that are all held together by gravity.

• planet

• star

• moon

• galaxy

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The Milky Way is a ________ that contains more than 200 billion stars.

• solar system

• galaxy

• universe

• nebula

Between the inner and outer planets, there is a belt of space rocks called ___.

• asteroids

• meteors

• comets

• stars

Stars appear in the night sky at different times of the year because of Earth's __________.

• rotation on its axis

• revolution around the Sun

• gravitational pull

• tilt of its axis

Why do the stars appear in a different position in the night sky during different times of the year?

• Because the Earth is moving closer to or farther from the stars

• Because the stars themselves are moving around the Earth

• Because the Earth's rotation on its axis changes the stars' position

• Because the Earth's revolution around the Sun changes our view of the stars

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Based on the data in the table, which statement is true about the length of a year on different planets?

• The farther a planet is from the Sun, the shorter its year.

• The farther a planet is from the Sun, the longer it takes to orbit.

• A year on Mercury is longer than a year on Earth.

• The further a planet is from the Sun the longer its rotation.