Vocabulary 5 (Solar System)

A terrestrial planet

• is outside of our solar system

• has a solid, rocky surface

• is one of the outer planets

• is sometimes called an ice giant

a body of rock, located in a nebula, which is a building block to form planets

• moon

• asteroid

• comet

• planetesimal

What does "rotation" mean in astronomy?

• A body that is spinning on its own axis

• A body that is going around another body

• A body that is moving in random directions

• A body that has come to rest

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What is an astronomical unit (AU)?

• the distance light travels in a year

• the average distance between Earth and sun

• One billion miles

• One billion years

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revolution

• the time it takes for a body to reach another point in the solar system

• the motion of a body spinning on its axis

• the motion of a body that travels around another body in space

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the path that a body follows as it travels around another body in space

• orbit

• the place that a body starts from in space

• the time it takes for a body to spin once on its axis

• the streak of light created when when something burns up as it re-enters the atmosphere.

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What causes day and night?

• Earth's revolution around the sun

• Earth's tilt on its axis

• Earth's rotation on its axis

What do we call it when the planet is rotating counter-clockwise.

• retrograde rotation

• prograde rotation

• nograde rotation

Name the outer planets

• Mars, Jupiter, Uranus, Venus

• Mercury, Earth, Saturn, Jupiter

• Jupiter, Saturn, Uranus, Neptune

• Mercury, Venus, Earth, Mars

All planets have what type of orbit around the sun?

• circular

• eliptical

• triangular

• square