February 25, 2008

February 25, 2008 - Official word from the international...

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February 25, 2008 ONLINE HW IS DUE FRI AT 8PM SBO OBSERVING WED FEB 27 BRING LEC-TUTORIALS FRI EXAM 2 IS NEXT FRI! Pluto o Much smaller than other planets o Strange orbit compared to other planets o Icy, comet-like composition o Its moon Charon is similar in size o Astronomers using HST recently found 2 other moons Kuiper belt o Fairly flat system (some thickness, but pretty much flat) o To find them they can see them moving and figure out how far they are away to know that it is in the in the belt o Found a 10 th planet in the belt which lead to the questioning of what a planet is Proposed definition of a planet o Orbits the sun (rather than a moon that orbits a planet o Is big o Is big enough so that its own gravity pulls it together into a sphere
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Unformatted text preview: Official word from the international astronomical union (IAU) o A planet is a celestial body that Is in orbit around the sun Has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape Has cleared the neighborhood around its orbit o A dwarf planet is a celestial body that Is in orbit around the sun Has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape Has not cleared the neighborhood around its orbit Is not a satellite Relieve lactic...
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