Grade 5 Unit 3 The Solar System and the Universe

A ______________is the amount of time it takes for the Earth to revolve, or go around, the Sun.

• month

• year

• century

• decade

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The force that keeps all objects near the Sun from flying off into space is

• gravity.

• magnitism.

• electrical.

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The path one space object takes around another space object is called

• a revolution

• a rotation.

• an orbit.

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The Earth rotates, or spins around on its axis, once every

• 27 days or one moonth.

• 365 days or one year.

• 24 hours or one day.

The imaginary line that goes through Earth from pole to pole is called Earth's _______________________.

• equator

• axis

• orbit

Earth's day/night cycle is caused by Earth's

• orbit.

• revolution.

• rotation.

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The longest day of the year and the beginning of Summer is the ____________________________.

• Spring or Fall Equinox

• Summer Solstice

• Winter Solstice

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The shortest day of the year and the beginning of the Winter is ______________________.

• Spring or Fall Equinox

• Summer Solstice

• Winter Solstice

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The days that mark the equal hours of day and night are called ________________________.

• Spring or Fall Equinox

• Winter Solstice

• Summer Soltice

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A ______________________________ is made up of a star and the planets and other space objects that revolve around it.

• galaxy

• universe

• solar system

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