Part 2 in this series about the Expansion of the Universe deals with the difficulty astronomers have in measuring distances across galaxies. Rob Knop discusses how the expansion rate is changing and how astronomers are comparing the past to current rates of expansion using ground-based and space telescopes.
Listen to the second installment in this series of Stellar Conversations about the expanding universe with Rob Knop, assistant professor of Physics and Astronomy.
"Stellar Conversations" is produced by Vanderbilt Dyer Observatory.
Contact: Nancy Dwyer, (615) 373-4897
nancy.dwyer@vanderbilt.edu