sentence: Stars are made in nebulas.
sentences_after: These are big areas that has more gas than normal space has. The gas in a nebula is attracted to all the other gas by gravity. This makes the gas in the nebula very thick. Stars form in these thick areas. The Orion Nebula is an example of a place where gas is coming together to form stars.
concept_name: star
headings: Star Birth and life and death of stars
categories: Astrophysics