Universe

What is a large collection of gas, stars, and dust that is held together by gravity?

• star

• galaxy

• asteroid

• universe

Small rocky bodies that orbit around the sun are called:

• asteroids

• meteors

• meteorites

• comets

Which one is the correct order from the smallest unit to the largest unit?

• planets, solar system, universe, galaxy

• universe, solar system, planets, galaxy

• universe, solar system, galaxy, planets

• planets, solar system, galaxy, universe

A large cloud of gas and dust in interstellar space; a region in space where stars are born.

• protostar

• galaxy

• nebula

• star

A small, hot dim star that is the leftover of an old sunlike star.

• red dwarf

• main sequence

• white dwarf

• giant

A gigantic explosion in which a massive star collapses and throws its layers into space.

• black hole

• supernova

• neutron star

• nebula

Most distances in space and to stars outside of our solar system are measured using:

• parsec

• astronomical unit

• miles

• light year

When a mass of hydrogen has enough density, it begins to fuse the hydrogen atoms together and produces heat and light. What is this classified as?

• nebula

• star

• galaxy

• planet

Our star is under which of the following categories?

• red giant

• super giant

• red dwarf

• main sequence

What separates the inner planets from the outer planets in the Solar System?

• comet belt

• asteroid belt

• meteor belt

• other planets