Crash Course Astronomy

The phases of the moon are caused by

• the rotation of the sun

• the rotation of the moon

• the tides

• the reflection of the sun

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The moon is ____ km across.

• 20,000

• 15,000

• 90,000

• 35,000

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The Moon looks bright because it is

• sitting in full sunlight

• it has an interior light source

• it's made of mirrors

• a ball of fire

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The part of an object that faces the sun is called

• illumination

• the bright side

• the dark side

• day bright

The line that separates the lit and unlit sides is called the

• terminator

• alien

• equator

• divider

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The new moon phase happens when the Moon is ____ the earth and the sun.

• beside

• behind

• next to

• between

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The word ______ comes from the word Moon.

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When the visible part of the Moon is getting bigger we say it is

• becoming new

• waxing

• waning

• getting full

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When the Moon is 90^o from the Sun, though it appears half full, we call that phase

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A complete moon cycle takes _____.

• 29.5 days

• 365 days

• 180 days

• 7.25 days

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