notes/ planets
DESCRIPTION
NASA. /Notes/ Planets. NASA. The story so far:. Protoplanetary disk. NASA. Gas and dust left-over after the formation of the star. http://www.maths.qmul.ac.uk/~masset/movies/flyby.png. Gravity. Begins pulling together bits of rock and gas. NASA. Gravity. Planetesimals. NASA. - PowerPoint PPT PresentationTRANSCRIPT
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/Notes/ PlanetsNASA
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Th
e s
tory
so
far:
NASA
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Protoplanetary disk
Gas and dust left-over after the formation of the
star.
NASA
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http://www.maths.qmul.ac.uk/~masset/movies/flyby.png
Gravity
Begins pulling together
bits of rock and gas
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Gravity
NASA
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NASA/JPL-Caltech/T. Pyle (SSC)
Planetesimals
Baby planets
NASA
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They’re violent
NASA
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NASA/JPL-Caltech/T. Pyle (SSC)
Planets form
Planetesimals combine and grow larger until they become planets
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What is a planet?
NASA
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1. Orbits the Sun
The Moon (not a planet)
NASA
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NASA
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2. Large enough for gravity to make it round
Phobos (a moon of Mars- not a planet) NASA
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Moon
Phobos
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Earth
Moon
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3. Has “cleared it’s neighborhood” of debris
Pluto (not a planet) NASA
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Types of Planets
NASA
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Gas GiantsNASA
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Made mostly of hydrogen and helium
NASA
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May not have any solid ground
Probably no surface like on the Earth
NASA
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All have rings and many moons.
NASA
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Jupiter
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Saturn
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Uranus
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Neptune
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Terrestrial Planets
NASA
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Are made of rocks similar to the Earth
NASA
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All have iron cores
NASA
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Have craters from asteroids and comets
NASA
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NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Mercury
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NASA/NSSDC
Venus
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NASA
Earth
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NASA
Mars
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http://www.kiroastro.com/writings/perspective
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http://commons.wikimedia.org/wiki/File:TheTransneptunians_Size_Albedo_Color.svg
Dwarf Planets
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Orbit the Sun
NASA
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Are large enough for gravity to make them round
NASA
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Have NOT cleared their neighborhood
NASA
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A new type of planet
Only used since August, 2006
NASA
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Earth
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Extrasolar Planets
• Extrasolar Planet- a planet orbiting a star other than the Sun
– As of Feb. 10, 2009:• 340 planets around other stars have been
discovered– Source: http://exoplanet.eu/catalog.php
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http://commons.wikimedia.org/wiki/File:Exoplanets_en.svg