Question

just like living things and humans, stars have a life cycle, which consists of birth, growth, development, middle age, old age, and death. the life cycle of a star spans over billions of years. section one - sequencing the stages below are not in the right order. number the stages in the correct order. the star begins to run out of fuel and expands into a red giant or red supergiant. stars start out as diffused clouds of gas and dust drifting through space. a single one of these clouds is called a nebula. what happens next depends on the mass of the star. heat and pressure build in the core of the protostar until nuclear fusion takes place. the force of gravity pulls a nebula together forming clumps called protostars. hydrogen atoms are fused together generating an enormous amount of energy lighting the star causing it to shine.

Explanation:

Stars form from nebulae. Gravity pulls nebula material into protostars. Nuclear - fusion occurs in the protostar's core when heat and pressure are high enough. Hydrogen fusion makes the star shine. Eventually, the star runs out of fuel and expands. What happens next depends on mass.

Answer:

1. Stars start out as diffused clouds of gas and dust drifting through space. A single one of these clouds is called a nebula.
2. The force of gravity pulls a nebula together forming clumps called protostars.
3. Heat and pressure build in the core of the protostar until nuclear fusion takes place.
4. Hydrogen atoms are fused together generating an enormous amount of energy lighting the star causing it to shine.
5. The star begins to run out of fuel and expands into a red giant or red supergiant.
6. What happens next depends on the mass of the star.