Read the paragraph then fill in the blanks with the correct word/s. It all starts with 1. Due to the force of gravity, the 2. stable. During this time, hydrogen is converted into 3. forming main cloud of gas and dust particle in outer space. became a protostar. Nebular fusion occurs at the center of the protoster and becomes gas is pulled together and eventually sequence star. The size of the star can be average or massive. A massive main sequence star that runs out of hydrogen fuel will begin to expand and cool down. continues to fuse with heavy elements and stops when 5. the biggest star in the universe. The red super giant the core of the star. At this point, red super giant will become a supernova after This is 4. is converted in hundreds of years.​