Unit 3 Test

Which of the following best represents the motion of galaxies in the universe?

• A

• B

• C

• D

A light-year measures

• A. distance

• B. miles

• C. time

• D. velocity

The real name for the North Star is

• A. Betelgeuse

• B. Polaris

• C. Rigel

• D. Sirius

Our sun is classified as a

• A. orange dwarf

• B. yellow dwarf

• C. yellow giant

• D. yellow supergiant

Small and medium size stars are called

• A. dwarf

• B. giant

• C. main sequence

• D. supergiant

The diagram above probably shows a

• A. binary

• B. constellation

• C. galaxy

• D. universe

The first step in the life of a star is

• A. blue giant

• B. main sequence

• C. nebula

• D. protostar

The picture above shows the motions of the stars over a 24 hour time period. The star in the center is probably

• A. Alpha Centauri

• B. Betelgeuse

• C. North Star

• D. Sirius

The theory that the universe began with an explosion is called

• A. Abiogenesis theory

• B. Big Bang theory

• C. Plate Tectonics theory

Our sun is a

• main sequence star

• neutron star

• nova

• protostar