Astronomy 1 mid-unit review

Billions of stars in the same region of the universe are called

• solar systems

• asteroid belts

• constellations

• galaxies

They symbols below represent the Milky Way Galaxy, the solar system, the Sun, and the universe. Which arrangement of symbols is most accurate?

• 
• 
• 
• 

The diagram below represents a side view of the Milky Way Galaxy. At approximately what position is Earth's solar system located?

• A

• B

• C

• D

The unit most used by astronomers to express the distances to other galaxies is

• miles

• kilometers

• astronomical units

• light years

Based on the red shift data, most astronomers infer that the universe is currently

• expanding

• contracting

• moving randomly

• fixed and stationary

The Milky Way galaxy is best described as

• a type of solar system

• a constellation visible on Earth

• a region in space between Mars and Jupiter

• a spiral-shaped formation composed of billions of stars

If we observe a Doppler blue shift from a star, the star must be

• relatively cool in temperature

• moving away from us

• moving toward us

• a blue star

In the diagram, the spectral lines of hydrogen gas from three galaxies A, B, and C, are compared to the spectral lines of hydrogen gas observed in a laboratory. What is the best inference that can be made concerning the movement of galaxies A, B, and C?

• Galaxy A is moving away from Earth, but galaxies B and C are moving toward the Earth.

• Galaxy B is moving away from Earth, but galaxies A and C are moving toward the Earth.

• Galaxies A, B, and C are all moving toward the Earth.

• Galaxies A, B, and C are all moving away from the Earth.

An astronomer can estimate the temperature of a star by observing its

• size

• shape

• color

• brightness

What would the luminosity of a star be if it has a temperature of 6000K?

• 1

• .01

• 100

• 10,000