Step 3 How did the planetary disk form?

The matter around the center of the solar nebula spins up and flattens into a planetary disk. It is a thin disk of gas and dust around the forming sun at the center.

Step 4 What is a protostar?

The heat and pressure at the center of the planetary disk become so great that a protostar is formed. It will later become our Sun.

Step 5 What occurred during condensation?

Tiny dust particles from the cooling planetary disk (gas) begin to grow by a process called condensation where one atom molecule is added at a time to make larger particles.

Step 6 How did accretion help form planetesimals?

The particles in the planetary disk begin to stick together to form larger particles that end up the size of boulders or asteroids through accretion. These large bodies are called planetesimals.

Step 6 What is accretion?

sticking together of solid particles to produce a larger particle

Step 6 What is a planetesimal?

small body formed from solar nebula that eventually grows into a protoplanet

Step 7 How were the planets eventually formed?

The planetesimals accelerate in growth accumulating all of the solid matter close to their own orbit. These are the protoplanets which will later become the planets of our solar system.

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How did the solar nebula form?

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What caused the solar nebula to collapse in on itself?

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Solar Nebula Theory

Explains major steps in formation of solar system

Question	Answer
Step 1 How did the solar nebula form?	A cloud composed mostly of hydrogen and helium as well as gas and dust forms from previous generations of stars. This cloud is from which the solar system is theorized to have originated.
Step 2 What caused the solar nebula to collapse in on itself?	Due to some disturbance (scientists believe a supernova explosion) the solar nebula begins to gradually collapse in on itself.
Step 3 How did the planetary disk form?	The matter around the center of the solar nebula spins up and flattens into a planetary disk. It is a thin disk of gas and dust around the forming sun at the center.
Step 4 What is a protostar?	The heat and pressure at the center of the planetary disk become so great that a protostar is formed. It will later become our Sun.
Step 5 What occurred during condensation?	Tiny dust particles from the cooling planetary disk (gas) begin to grow by a process called condensation where one atom molecule is added at a time to make larger particles.
Step 6 How did accretion help form planetesimals?	The particles in the planetary disk begin to stick together to form larger particles that end up the size of boulders or asteroids through accretion. These large bodies are called planetesimals.
Step 6 What is accretion?	sticking together of solid particles to produce a larger particle
Step 6 What is a planetesimal?	small body formed from solar nebula that eventually grows into a protoplanet
Step 7 How were the planets eventually formed?	The planetesimals accelerate in growth accumulating all of the solid matter close to their own orbit. These are the protoplanets which will later become the planets of our solar system.

Created by: odtanner

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