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Lecture02 - Iclickers Please register your clickers at...

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Iclickers Please register your clickers at iclicker.com provide your first and last names your Rutgers student ID name, the name you use to login to sakai and eden. DO NOT use your student ID number! your clicker number (under bar code on back of clicker) You can re-register clickers as needed You do not need to register again if you have done so previously for another course
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Previous Lecture The Scientific Method traditional Kuhn's paradigm & revolution idea Scale of the Universe size time
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Observing the Stars Stellar Positions: Astrometry Instrumentation Transit Telescopes (groundbased) Photographic Plates Electronic imagers Hipparcos and Hubble space telescopes Careful positional observations over a series of years reveal two types of motions: parallax and proper motion
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Parallax Apparent motion of an object due to the real motion of the observer Astronomical parallax arises from Earth’s orbital motion about the Sun 1 year periodic oscillation of star’s position Parallax is the fundamental distance measurement tool for stars no theoretical uncertainties
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Parallax
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