Did you know that the sun has a life cycle just like a frog? It started as a nebula which is where baby stars are born. Then, it became a protostar. Right now our sun is in the main sequence stage. It will be in this stage for another 5 billion years. Then, it will become a red giant and it will expand and collapse on itself. Then, it will become a white dwarf and finally a black dwarf and the star is finally dead. But some astronomers think it might become a supernova and it will explode. It might become a pulsar or a black hole or all that energy will recycle and become a nebula and start all over again. But don’t worry about the expansion or explosion part because it won’t happen while we’re living.