Olber’s Paradox:
Why is the night sky dark?
Olber’s Paradox:
Why is the night sky dark?
The Hubble Law and the
Age of the Universe
Ho = 72 ±8
km/s/Mpc
Hubble Law: Everyone sees same expansion
Universal Expansion: Balloon Analogy
Early History of
Universe?
Run time “backwards” to understand
Consider a molecular H2 , He gas as it gets hotter
Critical points with time running forward
First prediction from Big
Bang model:
Cosmic Background Radiation
Cosmic Microwave Background Observations
Second prediction from
Big Bang Model:
Abundance of the light elements
General Relativistic Description
Mass and the Curvature of Space
How to test the amount of curvature
Implications of Slowing Expansion Rate
Is the expansion rate slowing?
Measuring deceleration using supernovae
Tests using
the Origin of Structure