The sun is a __, a huge ball of very hot gases.

The imaginary line that passes through Earth's poles is Earth's __

Everything that exists, including planets, stars, dust, and gases, is the __.

The gravitational force of a star holds a __ in orbit around it.

A __ contains a group of stars, gas, and dust.

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

How are earth and the moon alike?

Which of these is the basis for timekeeping on earth?

Which of these occurs when it is summer in the Northern Hemisphere?

Which is a true statement about the planets in our solar system?

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