Which galaxy is Earth found in? Explain your reasoning based on what you know about our solar system's location in the universe.

• Black Eye

• Milky Way Pinwheel

• Pinwheel

• Andromeda

Hubble's research changed our understanding of the universe. Using evidence from scientific discoveries, explain what Hubble found about the observable universe.

• contracting.

• cyclical.

• expanding.

• stationary.

Which hierarchy represents the levels of organization in the universe?

• Universe > Galaxy > Solar system > Earth

• Universe > Solar system > Earth > Galaxy

• Solar system > Galaxy > Earth > Universe

• Galaxy > Universe > Earth > Solar system

Galaxies are classified in a specific way. Using your understanding of astronomy, explain why this method of classification is important for scientists.

• stars

• age

• shape

• color

The theory of an expanding universe was developed based on a specific phenomenon. Use your reasoning skills to identify which phenomenon this was and explain its significance.

• planetary green shift

• galactic red shift

• galactic yellow shift

• planetary purple shift

Ptolemy and Copernicus were early astronomers. Ptolemy believed that Earth was the center of the solar system and Copernicus believed that the Sun was the center of the solar system. Which model would the astronomers most likely use to support their beliefs?

• Ptolemy and Copernicus would both use the geocentric model.

• Ptolemy would use the heliocentric model and Copernicus would use the geocentric model.

• Ptolemy would use the geocentric model and Copernicus would use the heliocentric model.

• Ptolemy and Copernicus would both use the heliocentric model

The diagram shows a model. Which theory does this model best support?

• big bang

• geocentric

• special relativity

• heliocentric

The diagrams show two models. Which statement best describes both models?

• Model X is the heliocentric model in which Earth is the center of the solar system; model Y is the geocentric model in which the Sun is the center of the solar system.

• Model X is the geocentric model in which the Sun is the center of the solar system; model Y is the heliocentric model in which Earth is the center of the solar system.

• Model X is the heliocentric model in which the Sun is the center of the solar system; model Y is the geocentric model in which Earth is the center of the solar system.

• Model X is the geocentric model in which Earth is the center of the solar system; model Y is the heliocentric model in which the Sun is the center of the solar system.

Which image most likely represents the Milky Way galaxy?

• Image A

• Image B

• Image C

• Image D

A spiral galaxy

• has an undefined shape that is constantly changing.

• has a bulging middle and arms that coil outwards.

• is flattened and elongated.

• is perfectly round.