1. Question of the Day
What are the four types of telescopes? Why do we care?
WWBAT: Describe the telescopes and define the Nebular Theory
Homework: study for the quiz tomorrow

2. Nebular Theory

3. Gravity Definition: attractive force bringing items towards itself
Bigger objects have more gravity
Earth has more gravity than human, but moon has less than earth

4. Inertia
Definition: an object in motion stays in motion; object at rest stays at rest
The more dense something is the faster it spins

5. Rotation vs. Revolving Rotation: spins on an axis
Revolution: travels around an object
In the case of the Earth it revolves around the sun

6. Formation of the Solar System
Nebular Theory: The sun and the planets formed from a rotating disk of dust and gases
Nebula: a cloud of dust and gas that begins rotating due to gravity

7. Question of the Day What is the Nebular Theory?
WWBAT: Describe Nebular Theory and the vocab
Homework: none 

8. Steps of Formation First Step
Cloud not dense, less dense than air and a vacuum
Particles and gas gravity is pulling each other together, making it more dense
Think of dust on a floor, it always seems to slowly clump together

9. Steps of Formation Second Step Cloud is spinning slightly
Becoming more dense so spins faster
Spinning begins to create dense core in the middle of cloud

10. Third Step-Planetesimals
Steps of Formation
Third Step-Planetesimals
As the nebula spins, small pieces of matter collide and stick together forming planetesimals
Oddly shaped
Planetesimals grow larger, gain more gravity, and become rounded, making them planets
Some planetesimals do not stick together to make planets, instead remain as asteroids

11. Nebula
Nebula starts to spin.
c. Most of the mass goes to the middle for the sun.
Planetesimals form.
e.Planets form in orbits around the sun.

12. Our Solar System 99.85% of the mass of the Solar System is in the sun
Sun: x10^30 kg
Earth: x10^24 kg
**REMEMBER: every power is ten times bigger

13. Can you name the planets?