Question

what are the benefits of stars and planets ?​

Answer 1

Explanation:

1. The benefit of stars is that they are factories for metals, that run for billions of years, transmuting hydrogen into heavier elements, and occasionally explode like firecrackers, creating in a relatively few seconds enormous quantities (by our standards) of exotic heavy elements. Without stars, the Universe would be made up of Hydrogen and maybe a little Helium. As a minor side effect, they maintain a tiny fraction of their protosolar mass in the form of orbiting bodies.
2. The benefit of planets is that they formed from the elements created in stars, in a huge variety of sizes, compositions, and environments, and then orbit their Suns in (mostly) stable orbits for billions of years.