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Pinkygotfanzz

Answer:Stars are formed in clouds of gas and dust, known as nebulae. Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years. The exact lifetime of a star depends very much on its size.

Lanuel

A star can be defined as a giant celestial (astronomical) object that is made up of a luminous sphere of plasma bounded together by its own gravitational force.

Generally, a star consists of two (2) main interstellar hot gas and these are:  

I. Hydrogen (H).

II. Helium (He).

Some of the examples of a star are;  

  • Sun (the closest to planet Earth).
  • Antares.
  • Canopus.
  • Vega.
  • Betelgeus.

A nebula simply refers to a low-density cloud of interstellar hot gas (hydrogen and helium) and dust.

Basically, a nebula is needed for the creation or formation of a star.

Hence, the role of a nebula in the life cycle of a star include the following:

Stage 1: The temperature increases in the center of a nebula, thereby, causing the small nuclei of atoms to fuse.

Stage 2: The nebula gets hotter and brighter as the nuclear fusion sets off a chain reaction while providing enough energy to turn the nebula into a star.

Read more: https://brainly.com/question/17934476

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