CH 25.5 Solar System Formation . Objectives: How did our solar system form? What evidence supports our ideas?. http://atropos.as.arizona.edu/aiz/teaching/nats102/mario/solar_system.html. Nebula Theory. The solar system formed fr om a cloud of dust and gas (nebula). 4.6 billion years ago
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How did our solar system form?
What evidence supports our ideas?
The solar system formed froma cloud of dust and gas (nebula).
4.6 billion years ago
Nebula produced by the explosion of a previous star.
Protoplanetary disk forms when gravity pulls particles and gas to the center.
Disk begins to spin (possibly because of a shock wave from a “nearby” supernova.
Gravity continues to contract the cloud to the center – making it spin faster (angular momentum … think ice skaters spinning)
Protosunat center Sun when temperatures reach millions of degrees and NUCLEAR FUSION BEGINS.
Nuclear fusion combines hydrogen atoms together to make helium and releases LOTS of ENERGY! Stars begin to shine!
Accretion: Growth by colliding and sticking together
Planetessimals(asteroid size) Protoplanets(moon size) Planets
Inner Solar System = “Rocky” PlanetsHotter Metals & Rock condense (gas solid) @ higher temps.
Outer Solar System = “Gas” Giants
Colder Light gases like H; He; Ammonia; Methane; Water condense (gas solid ice crystals) @ cold temps.
Sun is 99.9% of mass – in center.
Planets all orbit in same plane.
Planets orbit in same direction.