A star goes throgh different stages until it gets completely formed. The first stage is nebula. Nebulae are _dust and gas_ where _ stars_ can form.
The star cycle is the sequence of changes that a star undergoes throughout its existence.
The evolutive stages of a star differ between an average star and a giant star.
However, the first stages of the cycle are shared by all of them.
Stars are born from the nebula that is the dust and gas particles condensation due to gravity effect in the interstellar clouds
It is a more advanced level of condensation.
Equilibrium between gravity and nuclear fusion helps the star keep stable as long as the fuel lasts.
Hence, according to this resumed introduction to stars cycles, we may say that
Nebulae are _dust and gas_ where _ stars_ can form.
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