Transcript Chapter 10 Section 2 - SupplementalEducationalServices

A Solar System is Born
Chapter 10 Section 2
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After the Big Bang rocks
and gases begin moving
around each other.
*Nebulas are mixtures of
gas and dust.
*The outward pressure
balances with the inner
gravitational pull to keep
a Nebula from
collapsing.
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*The center of the
collapsed Nebula
would become
very dense and
hot.
*Over time, the
nebula will become
flattened into a
rotating disk.
Planetesimals
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In a solar nebula, bits of
dust collided and stuck
together to form small
bodies.
The largest of these
colliding bodies are
called planetesimals, or
small bodies.
Gas Giants
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The largest planetisimals were far enough away from the solar
nebula to attract nebula gases.
*The planets J,S, U , N are known to be gas giants.
The Sun is Born
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When the gas in the
nebula’s center stopped
collapsing, our Sun was
born.
*Birth of a Planet, in
order:
• 1. The solar nebula began to collapse.
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2. The solar nebula rotates and flattens. It
grow warmer near its center.
3. Planetesimals begin to form.
4. The largest of the Planetesimals grow in
size and attract more gas and dust.
5. Planets begin to grow as planetismals and
collide with one another.
6. The sun is born. The remaining gas and
dust are removed from the solar system.
Inner Planets
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*The inner planets of our
solar system are mostly
rocky. They are
M,V,E,M.
After the planets were
formed, the center mass
of the solar nebula
became so dense and
hot it formed Helium.