Universe

Our solar system is located in which galaxy?

• Andromeda

• Milky Way

• Proxima X

• Triangulum

True or False: Solar systems are larger than galaxies.

• True

• False

What are 90% of stars classified as on the H-R diagram?

• Supergiants

• White Dwarfs

• Main Sequence

• Giants

On the H-R diagram, it compares a star's brightness to its

• Temperature

• Composition

• Age

What is the name for space and everything in it?

• galaxy

• universe

• solar system

• planet

Which theory states that the universe began from a small point that began to expand 14 million years ago?

• Big Bang Theory

• Plate Tectonic Theory

• Continental Drift Theory

• Theory of Realtivity

A system of billions of stars, gas, and dust held together by gravity is called a-

• star

• nebula

• galaxy

• universe

Which answer choice best describes a star?

• a sphere of gas and dust that contains many elements and produces light from fusion and fission reactions.

• a collection of gases from several nebulae hot enough to cause a nuclear reaction

• a sphere of matter with a temperature and density great enough to cause a nuclear reaction at its center

• a collection of hot gases that produces heat but no light

Name the stars located in area A.

• main sequence

• super giants

• white dwarfs

• giants

What spectral class do the hottest stars belong in?

• B

• F

• M

• O