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The Nebular Hypothesis

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Cassandra Schmidt

on 7 May 2014

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Transcript of The Nebular Hypothesis

All of the planets travel in the same direction (counterclockwise)
The sun and most of the planets rotate in the same direction (counterclockwise)
All of the planets orbit the sun in the same plane
Angular Momentum and Gravity are clearly understood
Nebula are very real and very common
We can see stars in different phases of development when we observe nebular through a telescope.

What makes this a good hypothesis?

A. Fire
B. Only spinning
C. The Big Bang
D. Friction and compression
What formed the sun?
A. Nuclear fusion
B. How stars are formed
C. A math equation in this class
D. Gravity pulls inward the cloud, allowing it to spin faster

What is Conservation Of Angular Momentum?

A. The entire nebula
B. Part of a solar system
C. Part of a star while it is alive
D. Small part of a nebula with concentrated dust and gas
What is an “egg”?
A. Planets
B. Sun
C. Asteroids
D. Dwarf planets
E. Meteoroids
F. Moons
G. All of the above

What makes up the solar system?

Gas and dust particles in the disc condensed forming ice and rock
Ice and rock particles continued to collide and combine into large planetesimals
Planetesimals compressed and collided to form the planets and moons

The Formation of the Planets

Within the center of the disc:
Compression and Friction
Temperature increase
Sun “turns on”
Nuclear fusion began
Hydrogen fusion

The Formation of the Sun

The Solar System formed from a nebula as gas and dust came together to form the sun and planets

The Nebular Hypothesis
The explanation for the formation of the solar system
The Solar System formed ~ 4.6 billion years ago
Evidence from:
Meteorites (4.5-4.6 billion years old)
Moon rocks (~4.0 billion years old)
Earth Rocks(~3.9 billion years old)
Sedimentary minerals

The Nebular Hypothesis
Inner – Mercury, Venus, Earth, Mars
Outer – Jupiter, Saturn, Uranus, Neptune
Moons (satellites)
Dwarf planets

What makes up the Solar System?

The Nebular Hypothesis:
The Formation of the Solar System
A. Debris collecting together and making a larger object due to gravity
B. The solar system spinning
C. Same thing as nuclear fusion
D. A really cool band name \m/

What is accretion?
A. 10%
B. 45%
E. 100%

What percentage of the spinning disc created the sun?
A. 4.6 million years
B. 3.8 billion years
C. 65 million years
D. 4.6 billion years
E. 1 trillion years

How old is the solar system?

Solar winds blew excess gas toward the outer part of the solar system*
This is what made the
Inner planets rocky
Outer planets gas

The Formation of the Planets

An external force (like a supernova) caused the egg of the nebula to spin counterclockwise
Force that pulls two objects towards one another
Pulls the cloud inward creating a flattened disc
The Conservation of Angular Momentum
As the disc begins to flatten it begins to spin faster
Think of a ice skater – she will go faster when she brings her arms closer

The Big Spin

Eggs in nebula are where stars are born

All stars, including our sun come from nebula

Cloud of gas and dust
Remains of old stars that have exploded (supernovas)
Contain all of the natural elements
Concentrated part of the nebula where stars are born

The Beginning

Planets, comets, Asteroids, Moons

90% of the material was in the center

10% of the material was in the disc surrounding it

The Disc


Where does the sun get its energy?
How did our solar system form?
Fill out your Confirming to Extending Grid...
*The Sun ignites nuclear fusion in its core on and generates a strong outward flow of material (an extreme Solar Wind). The strong outward wind cleans out the gas from the Solar System arresting planet formation. The wind, however, does not clear out solid material. The large chunks of solid debris have a substantial impact on the evolution of the young planets.
Whiteboard Review! Grab a small whiteboard and marker!
Answer: G (all the above)
Correct: D (4.6 billion)
Correct: D
Correct: D
Correct: C
Correct: D
Correct: A
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