OEAS 106 L4 Orig II F10

OEAS 106 L4 Orig II F10 - OEAS 106 Introductory...

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OEAS 106 Introductory Oceanography Lecture 4 Origins II: Our place in the Universe 9/3 /10 Listening to the Universe
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The Ocean Planet The Ocean Planet Origins Galaxies, Planets, and Ocean Basins How did we get to have a planet with Oceans? We need to work our way Through the origin of “the Ocean Planet.”
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Origins Edwin Hubble and the Expanding Universe Edfwin Hubble 1889-1953 The “Hubble Deep field” on the edge of the observable Universe, as seen by the Hubble space telescope, reveals a sea of galaxies. In 1925, Edwin Hubble devised a method for determining the distance to the nearer galaxies by observing pulsating stars (Cepheid variables), Their luminosity (true brightness) is a function of their period Eta Aquilae a Cepheid Variable in the constellation Aquila
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The shift of the H α line toward the red end of the Light spectrum from these stars is an electromagnetic Doppler effect . It shows that they are receding from us! Origins Edwin Hubble and the Expanding Universe When an ambulance passes us on the street we hear an acoustic Doppler effect. The pitch drops. Light from all of the Cepheid variables that Hubble looked at was red-shifted . The spectrum of the Sun shows absorption lines. Certain frequencies have all of their energy absorbed as they pass up from the “chromosphere” through the solar atmosphere. Solar Atmosphere (absorbs light) Chromosphere (zone emitting light)
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nearer galaxies. He showed showed that the further away a galaxy is, the faster it is moving away from us! His plot of galactic speed versus distance is presented below as a simple equation (Hubble’s Law). Origins Edwin Hubble and the Expanding Universe This is a balloon being blown up. Dots are painted on the balloon. Each dot sees the others as moving away. If every galaxy is moving away from us, A loaf of raisin bread rising in an oven is a better analogy because the raisins are moving way from each other in three dimensions. What Hubble was observing was the
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This note was uploaded on 05/30/2011 for the course OCEA 107 taught by Professor Eee during the Spring '11 term at IPR.

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OEAS 106 L4 Orig II F10 - OEAS 106 Introductory...

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