• Hubble’s Law

• Cosmological redshift

• Distance ladder

• Big Bang theory

• Universe

• Cosmological principle

• Dark energy

• Supernovae

• Lookback time

• Galaxies

• History of astronomy

• Standard candles

Suggested investigations which could come before this one:

Students learn how to distinguish between two different types of supernovae in the Exploding Stars investigation, then use a Type Ia supernova light curve to calculate the distance to a galaxy.

In Unlocking the Distances to Galaxies, students analyze light curves of Cepheid variable stars and use the period-luminosity relation to determine distances to galaxies.

Suggested investigation which could come after this one:

In Exploring the Observable Universe students use the redshift and position of galaxies to explore how the large scale structure of the Universe has changed over time.