Earth Science Test Review (Space/Universe)

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

The imaginary line that passes through Earth's poles is Earth's ___________.

Each shape the moon seems to have throughout the month is called a __________.

A pattern of stars is a _________.

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.

Which of these is the basis for timekeeping on Earth?

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