Unit 1 : The Universe

While planets are smaller than stars, planets are generally larger than which of the following?

• the stars they orbit around

• the solar system

• the galaxy they are contained within

• the other bodies in a solar system

Where do stars form?

• in a planet's core

• in nebulae

• on asteroids

• in sun spots on the surface of the sun

A large celestial body the is composed of gas and that emits light is a(n) _____________________.

A(n) ___________________ consists of one star or more than one star and all the objects that orbit around the central star.

Earth orbits a star called the moon.

• True

• False

The Earth and the Sun have the same composition.

• True

• False

Distances in the universe are extremely large.

• True

• False

The sun is just one of many stars in the Milky Way galaxy.

• True

• False

A(n) __________________________ is a large group of stars, gas and dust bound together by gravity.

A large, cold cloud of gas and dust in interstellar space is called a(n)_______________________________.