Lecture 34: The Expanding Universe
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How did we discover that the Universe is Expanding? What does
it mean that it is expanding? This lecture introduces Hubble's Law,
the observational evidence that the Universe is systematically
expanding. As galaxies get more distant from us, the apparent speed
of recession gets larger in proportion. The proportionality is the
rate of expansion, called the Hubble Parameter (H0). This leads us
to the idea of expanding space, and the Cosmological Redshift, which
combined with the Hubble Law allows us a way to estimate very large
cosmic distances. We will take up the more thorny issue of the
Cosmic Distance Scale in tomorrow's lecture.
Recorded 2006 February 23 in 1008 Evans Laboratory on the Columbus campus
of The Ohio State University.
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