Origin of the Solar System

In a star, nuclear fusion joins atoms of 

When the nebula begins to contract due to gravity the ____________ rises. 

The amount of matter in the solar nebula that was used to make the sun was 

A huge cloud of dust and gas that is the location for star formation is known as

The Solar Nebula Hypothesis explains

What force draws matter together into a dense central core?

Planetestimals collided to form protoplanets through the process of 

What caused the solar nebula to condense, spin, and contract?

Which of the following did not occur during the formation of the solar system?

Gravity is the force of attraction between two objects and is due to their