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Unformatted text preview: How do you weigh a galaxy?-Measuring the orbital velocity What are three ways galaxy clusters reveal dark matter?-Section of pg 654-Measuring the speeds of galaxies orbiting the center of the cluster, x-ray emissions from the hot gas between the clusters galaxies and observing how the cluster bend light as gravitational lenses What is baryonic matter?-Ordinary matter Whats a macho?-Dim star like objects Whats a wimp?-Non-baryonic matter and are subatomic particles There are expanding patterns; what are they?-recollapsing, accelerating, critical, coasting (665) At what rate is the universe expanding?-decelerating What is critical density?-Precise average density marking the dividing line between eternal expansion and eventual collapse...
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- Spring '06