Main sequence stars: They are middle-aged stars
Explanation:
During their life, stars go into different stages. The main stages of the life of a star are:
- Giant gas cloud: this is the first stage of the life of a star
- Protostar: this stage occurs when the molecules in the cloud start to aggregate - then temperature increases, and at some point it is enough to start the process of nuclear fusion inside the star
- Main-sequence star: this the phase that includes most of the life of a star, such as our Sun in its current situation
- Red giant: when a star runs out of hydrogen, it starts burning heavier elements (helium, and so on), becoming bigger at each step and turning into a red color
Then, the evolution of the star can continue in different ways, depending on the mass of a star:
- A low-mass star turns into brown dwarf
- A medium-mass star turns into a white dwarf
- A large-mass star becomes a red supergiant, and eventually explodes in a supernova explosion, leaving behind either a neutron star or a black hole
Therefore, the main sequence stars are the middle-aged stars.
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