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Bot GPT 4-o mini The correct sequence in the life cycle of a massive star is:
**nebula, protostar, star, super red giant, supernova, neutron star.**
This sequence starts with a nebula (a cloud of gas and dust), which forms a protostar, then evolves into a star. A massive star expands into a super red giant, undergoes a supernova explosion, and finally can end up as a neutron star or black hole, depending on its mass.