The sun is enormous. And by enormous I mean it's the largest object in our solar system. It's also the brightest, most powerful object within our solar system.
Our sun is a 4.5 billion year old Main Sequence Star with an average life expectancy of 10 billion years. However, It is neither the largest nor the brightest object in the universe.
What you need to know:
1. The 4 most common colors of stars in order from hottest to coolest:
• O or B-type stars are often blue in hue and can be categorized as Blue Giants or White Dwarfs. These stars are very, very hot.
• A-type stars, or white stars are hot and white, like some large Main Sequence stars.
• G-type stars are hot, yellow, and very similar to our Sun.
• M and K-type stars are the coolest stars; they appear red in color. However, K-type stars are slightly larger and warmer; nevertheless, they both appear red in the sky.
2. According to the Hertzsprung-Russel diagram, a Red Giant is an old, massive star that is luminous with low temperatures, meaning it's relatively cool. In contrast, Blue Giants are supermassive stars, equal in size to Red Giants, which are very young, very hot, and very luminous. Red Dwarfs are cool, Main Sequence stars that are old and burning slowly, slower than our Sun; which is a Main Sequence star categorized as a G2-type star. White Dwarfs are essentially the remaining core of an unstable Red Giant that had started fusing helium into carbon, at which point the star started expanding and contracting until ultimately expelling half of its mass into space creating a Planetary Nebulae with a burning-hot White Dwarf at its center. These White Dwarfs are not very luminous and are very small, but they do burn at very, very high temperatures. The Sun is the most luminous object in the sky; however, the Sun is not categorically the hottest or most luminous object in the universe. The Sun is a Main Sequence star about 4.5 billion years old, and one day it will eventually turn into a Red Giant.
If you have any questions I'll be glad to help.