What is created when a star undergoes a supernova explosion?

What force causes a Nebula to stop expanding, and then to start collapsing inward?

As a nebula collapses inward because of gravity, what percentage of the matter ends up forming a new star?

The material of the nebula that is not incorporated into the new star forms

As the nebula collapses, the center ______ because of conversion of kinetic energy to thermal energy

As the Nebula collapses, it starts_______faster and faster

Rapid rotation of the collapsing nebula causes the remaining material to form a ______ shape, instead of the 3 dimensional sphere it was originally.

The remaining 1 % of material in the Nebula's spinning disk starts combining together because of gravity, forming

As Planetismals orbit the new star, as they come near each other combine getting larger and larger, forming _________.

Protoplanets orbiting the new star combine with other ______ growing larger and larger.

Over time, the _________ attract the majority of matter from the solar system, leaving mostly empty space.

When the protoplanets have cleaned out the space between them, and have stable orbits, they become true _____.

Planets close to the sun have lots of metals and silicates. The first form as balls of lave, and then become hard and rocky. They are called

Planets farther out into space are formed mostly of gases like hydrogen and helium. They have no hard rocky surface. They are called _____.

large hard rocky objects orbiting between Mars and Jupiter are called ______.

Planets that are neither Hard and Rocky, or Gas Planets are called ________.

Objects made of ice and rocks that orbit the sun with very elliptical orbits, disappearing beyond the planets for many years at a time, and then reappear passing by the sun are called ________

Earth is a _____ planet.

Jupiter is a ________ planet.