Lec03 - billion real years Human history would be just last...

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Scale in distance, time, and speed • last time, we talked about size or distance scale • But also can refer to time, or even speed. • again, in astronomy time and speed scales are often much bigger than for our lives here on earth • and span a wide range • so again use the Exponents of ten: 10 X
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Hierarchy of Scale in the Universe
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Scale Range of our Universe From humans to edge of the universe in 26 Powers of Ten
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Time Evolution of the Universe
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Because of Fnite light speed, with greater distance we see back in time!
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The Cosmic Calendar If the entire age of theUniverse were one calendar year One month would be approximately 1
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Unformatted text preview: billion real years Human history would be just last 2 minutes! Motion and Speed v elocity = d istance/ t ime v = d/t d istance = v elocity x t ime d = v t t ime = d istance/ v elocity t = d/v Pop Quiz Given Earth has diameter of about 8, 000 miles, what is speed (in mi/hr) of the equator due to earths rotation? Hint: What is EarthCircumference? Hint: How many hours in a day? Our Rotation speed on Earth NASA movie of rotating earth Our orbit (with earth) around the sun Our orbit (with sun) in the Milky Way Andromeda Galaxy: nearby twin of MilkyWay Back to Earth. .....
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This note was uploaded on 02/01/2012 for the course PHYS 133 taught by Professor Staff during the Fall '08 term at University of Delaware.

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Lec03 - billion real years Human history would be just last...

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