The Sun's Evolution:

1. Main Sequence Star: Currently, the Sun is a main sequence star, fusing hydrogen into helium in its core. This process provides the energy that makes it shine.

2. Red Giant: When the Sun runs out of hydrogen fuel in its core, it will expand into a red giant. This happens because the core contracts, heats up, and begins fusing helium into carbon and oxygen.

3. Planetary Nebula: Eventually, the Sun will shed its outer layers, creating a beautiful planetary nebula.

4. White Dwarf: The remaining core of the Sun, now mostly carbon and oxygen, will cool and shrink to become a white dwarf.

Why the Sun Won't Skip Steps:

* Mass: The Sun is not massive enough to become a supernova. Supernovae are the explosions of much larger stars, and they leave behind neutron stars or black holes.

* Fusion: To become a white dwarf, the Sun must go through the red giant phase, where its core contracts and heats up, allowing it to fuse heavier elements. This process is crucial for the Sun's evolution.

In summary: The Sun will become a red giant, then shed its outer layers to form a planetary nebula, and finally, the remaining core will cool and become a white dwarf. It will never skip the red giant phase.