Ch 25 5 solar system formation
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CH 25.5 Solar System Formation. Objectives: How did our solar system form? What evidence supports our ideas?. Nebula Theory. The solar system formed fr om a cloud of dust and gas (nebula). 4.6 billion years ago

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CH 25.5 Solar System Formation

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CH 25.5 Solar System Formation


How did our solar system form?

What evidence supports our ideas?

Nebula Theory

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

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!

Planets Grow by Accretion

Accretion: Growth by colliding and sticking together

Planetessimals(asteroid size) Protoplanets(moon size) Planets

Inner vs. Outer

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.

Evidence to Support

Sun is 99.9% of mass – in center.

Planets all orbit in same plane.

Planets orbit in same direction.


Extra-solar solar systems

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