Real life 'Death Star' observed destroying planets in its own solar system

Stars shine by converting hydrogen into helium through nuclear fusion. Once a star exhausts its nuclear fuel, it expands into a red giant, which can convert helium into carbon. When helium is depleted, the red giant contracts into a white dwarf, a dense remnant of the star's core. The gravitational pull of a white dwarf is strong enough to disrupt nearby planets. Changes in a star's mass can alter its orbit, potentially causing planets to move closer and be torn apart by the white dwarf's gravity.

What process converts hydrogen into helium in stars?

What happens to a regular star after it exhausts its nuclear fuel?

Describe the characteristics of a white dwarf.

How does a star's mass affect its orbit?

What can happen to a planet that orbits too close to a white dwarf?