* Huge Star: Main sequence stars come in a wide range of sizes, from small red dwarfs to giant blue stars.

* Begins to use the gases in its core: The defining characteristic of a main sequence star is that it is fusing hydrogen into helium in its core. This fusion process is what generates the star's energy and makes it shine.

Let's break it down:

* Stars are born from giant clouds of gas and dust.

* As gravity pulls these clouds together, they heat up.

* Eventually, the core of the cloud reaches a temperature and pressure high enough to ignite nuclear fusion.

* This is the birth of a main sequence star.

The star continues to fuse hydrogen into helium for the majority of its lifetime. Once it runs out of hydrogen in the core, it will evolve off of the main sequence and begin its journey towards becoming a red giant, white dwarf, or other types of stellar remnants.