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Lecture 28

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Department
Origins
Course
ORIGINS 2B03
Professor
Laura Parker
Semester
Fall

Description
Lecture 28Wednesday November 23 20111230 PMDark energyThe distance using Hubbles law and standard candles disagree with each other due to universes accelerationThe 1 priority to understand what dark energy isIs it constant or changes all the timeBig Bang modelHas been around for a while but the universe is more complicated than we thought1970s convincing evidence for dark matter1998 and since convincing for dark energyGalaxy collisionsGalaxy merging is fundamental to building up structure in the universeGalaxies that are colliding have stretched arms due to tidal forcesTheir relative velocities must not be too high for collision to occurThey have tidal tails extending from the galaxies that are collidingCollisions can trigger large amounts of star formation due to the dense collection of gasBlue stars are newly formed starsTidal forcedifferential forceDue to the gravity force of one side of the galaxy being weaker than the otherGalaxy merging is an ongoing pro
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