Arrange the events in the life of a star in the correct order. All that remains of the star now is the core. In some cases, the star turns into a black hole. As the nuclear fusion sets off a chain reaction, the nebula gets hotter and brighter and turns into a star. The star stays in the main sequence stage for a long time. The star runs out of hydrogen and turns into a planetary nebula or a supernova, depending on its mass. Heavy elements are created when the supernova explodes. The temperature increases in the center of a nebula, and nuclei begin to fuse.

Q: 1. 2. 3.

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