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The stages our a stars life in order.
What is Nebula➡️ Protostar➡️ Main Sequence ➡️Depending on the mass if it's low mass it goes to Red Giant ➡️ Planetary Nebula➡️ White Dwarf but if it's high mass then it goes to Super Red Giant➡️ Super Nova➡️ Neutron Star or a Black Hole