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

Nebular Theory

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

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

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

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

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

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

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

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

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.

Our Solar System 99.85% of the mass of the Solar System is in the sun Sun: 1.9882x10^30 kg Earth: 5.9742x10^24 kg **REMEMBER: every power is ten times bigger

Can you name the planets?