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Nebular hypothesis

Nebular hypothesis. Nebular Hypothesis Immanuel Kant Pierre Laplace in the late 1700’s. Our story starts with a nebula.

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Nebular hypothesis

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  1. Nebular hypothesis

  2. Nebular HypothesisImmanuel KantPierre Laplace in the late 1700’s

  3. Our story starts with a nebula

  4. **The dust particles and gases began to contract and rotate and like a ballerina who pulls in her arms it rotated faster. **As it rotated faster, it began to flatten out into a disk. With a central bulge in the middle which coalesced (accretion. **At some point because of the compression it ignited (nuclear fusion) and became a star. **Our sun which is about a million miles in diameter.

  5. Conservation of angular momentum demands that a contracting, rotating cloud (a) must spin faster as its size decreases. (b) Eventually, the primitive solar system came to resemble a giant pancake. The large blob at the center would ultimately become the Sun.

  6. The particles started to coalesce into rocks (planetary embryos) and the rocks into planetesimals (asteroids) which coalesced into planets. ACCRETION

  7. This model explains the disk shape of the orbits of the planets with the exception of Pluto (not really a planet) **the counterclockwise rotation of the disk and the planets.**Those planets all line up with each other, which is called the plane of the ecliptic.**It also explains the rocky inner planets and the gaseous outerplanets

  8. Being closer to the sun (hotter temperatures) made it impossible for gases like water to condense so rock was the only thing that could condense so close to the sun. Further away where it was colder the gases could condense which is how the Jovian planets were formed.

  9. The planets then began to go through DIFFERENTIATION: when a planet because of gravity changes from a homogeneous solar particle planet to a heterogeneous layered planet.   Planetary elements which separate include iron, which is heavy and silicate rock, which is lighter. Iron falls to the center of a planet and forms a core, silicate material stays in the middle, ice stays near the top.

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