Nebular theory

Nebula

According to the nebular theory, the solar system originated from a _____.

4.5 billion years ago

when did the solar system formed?

Nebula

-giant cloud of gas and dust in space.

-Cloud collapse
-Formation of the protoplanetary disk
-Growth of planets

3 major steps in the formation of the solar system:

Cloud collapse

-A shockwave from a supernova or the effect of a passing star.

-Due to gravity
-Gas pressure becomes insufficient

-the collapse at the center of the cloud ____ _____ _____ occurs when ___ ____ ___ ____ to support the mass if the cloud.

Smaller radius that spins faster.

-The collapsed cloud of interstellar gas and dust results to a _____ _____ ______ ______ ______.

-Metals and silicates
-Terrestrial planets
-Limited reserve of metallic elements

(Step 2: Formation of protoplanetary disk)
-______ ______ could exist near the sun because these compounds have higher boiling points.
-As a result, ____ ___ were eventually formed containing high concentration of these compounds.
-The terrestrial planets could not grow in huge diameter because of the ___ ____ __ ___ ____ in the solar nebula.

Planetesimal

-Dust and grains surrounding the sun eventually formed clumps. These clumps then accreted forming ________.
-________ is a small celestial body that once collide together. It tend to fuse to form the planets of the solar system.

Emmanuel Swedenborg (1688 - 1772)
Immanuel Kant (1724 - 1804)
Pierre Simon Laplace (1749–1827)

Proponents of the nebular theory:

-Particles surrounding Saturn repel each other
-It does not follow the law of angular momentum
-It did not consider Uranus and Venus which rotates in a clockwise direction

Drawbacks of the Nebular Theory:
-____ ____ ____ ___ ___ ____ which is contrary to the assumption that dust particles will be attached to each other forming a planet. 
-__ _____ _____ ___ ___ ___ ____ ___ ___ because if the nebular theory is correct then the sun should be spinning at a higher rate than the others.
-____ _____ ___ ___ __ __ ___ ____ __ while other planets rotates in a  counterclockwise direction.