Answer: Nebula → Red Dwarf → White Dwarf → Supernova
Notes: Stars have a life cycle that starts from a nebula, a cloud of dust and plentiful gas. From this, a protostar is formed which, if it has sufficient mass, becomes a red dwarf. As the star exhausts its hydrogen, it becomes a white dwarf and eventually, it may explode as a supernova. Not all stars go through the same cycle, as it depends on their mass.
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