Astronomy 10 9.27.06 - o The particles collapse into a disk...

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Astronomy 10 Cosmogony 9/27/06 In Astronomy the scale of a picture is important to understand o Have to understand that pictures that are the same size are not necessarily portraying objects of the same size The objects in the solar system are really small compared to the distances between them (find smallest particle that you can find the internal temperature) Nebulae: Clouds (in Latin); the singular form is Nebula o They are clouds o Places where stars and star systems are born o Nebulae contain Low Melting Points (“Volatile”) Gases o Hydrogen; H o Helium; He Ices o Water; H2O o Carbon Dioxide; CO2 o Methane; CH4 o Ammonia; NH3 Tars o Hydrocarbons; -C=C-C- High Melting Points (“Refractory”) Dust o Silicates Iron; Fe Nickel; Ni Zones within Nebulae condense o The pull in becomes stronger then the pull out o A spin starts to form o Particles keep knocking into each other and more motion forms in one direction then the other as the other random motions fade out
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Unformatted text preview: o The particles collapse into a disk because everything gets pulled into the center o Knots within the disk form to become planets o This is a continuous process No official boundaries between planetessimals and protoplanets o Planets are made of different materials because the planets are made of the materials that can condense at the temperature where they are forming i.e. If you are condensing a planet where Mercury, it is hot, so you can only use material that will condense at that high of a temperature • Comets o We do not know why an object come in from the Oort cloud or the Kuiper’s Belt o Dust tail is always yellowish and the Ion tail is always bluish Tails can disconnect Comet tails always point away from the Sun o Comet nucleuses are black Looked upon as a dirty snowball Comet nucleus are a bit oblong (kind of potato shaped) Made up of patches of the four ices...
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