1. A cloud of space dust or gas.
Nebula
A cloud of space dust or gas.

2. Nebular Hypothesis
VIDEO

3. Nebular Hypothesis cloud of mostly hydrogen & helium A.
Started rotating & collapsing toward center because of gravity forming an accretion disk , also the Sun forms C.
rocky & metallic materials form as nebula cools D.
collisions of particles created asteroid-sized objects (protoplanets or planetesmals) E.
Sun = most dense object, nuclear fusion
Rock / Terrestrial planets = more dense, heavy material, closer orbit
Gas / Jovian planets = least dense, lighter material, farther orbit
B. accretion disk
A. nebula
C. cooling
D. protoplanets
E. solar system

4. Barycenter The point between two objects where they balance each other
The actual center of our solar system
The sun orbits around this point
Barycenter Video
Music :)

5. Does the Moon orbit around the Earth?
Earth’s Barycenter
VIDEO
Sun’s Barycenter
VIDEO