The _________ is the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.

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The ________ is all of space, and all of the matter and energy that space contains.

___________ is a branch of science that deals with celestial objects, space, and the physical universe as a whole.

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_____________ is the science of the origin and development of the universe

What is produced in main sequence stars due to nuclear fusion?

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Where is Earth located?

What can be determined by examining the Hertzsprung-Russell diagram?

In ___________ smaller nuclei fuse together to become larger nuclei.

• nuclear fission

• nuclear fusion

• chemistry

• electricity

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_______ states that the time it takes a planet to revolve around the Sun is proportional to its distance from the Sun.

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________ states that the path of each planet around the Sun is an ellipse.

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