Question

section two - sequencing
the stages below are not in the right order. number the stages in the correct order.
_2_ 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 igniting the star causing it to shine.

Explanation:

Stars form from nebulae. Gravity pulls nebula into protostars. Heat and pressure in protostar lead to nuclear fusion. Fusion ignites star. Then star runs out of fuel and expands.

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 igniting 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.