Space Timeline Becca Douglas, Myles Gaines, Allison Huang, and Alyssa Yambor-Maul C period.
Class 21 : Other galaxies The distance to other galaxies Cepheid variable stars. Other methods. The velocities of galaxies Doppler shifts. Hubble’s law.
Cosmology. Observational evidence? “Cosmologists are often in error but never in doubt.” L.D. Landau.
