Question

according to the \life cycles of stars model,\ what happens to a sun - like star after the red giant phase? 1. it becomes a black hole 2. it undergoes a supernova explosion 3. it forms a planetary nebula 4. it turns into a neutron star

Explanation:

To determine the correct answer, we analyze the life cycle of a sun - like star:

1. A sun - like star (with a mass similar to the Sun) does not have enough mass to become a black hole or a neutron star, and it does not undergo a supernova explosion.
2. After the red giant phase, a sun - like star expels its outer layers, and these expelled layers form a planetary nebula, while the core becomes a white dwarf.

Answer:

1. It forms a planetary nebula