No. Our sun, a yellow dwarf is merely medium-sized.
The biggest sun discovered in the universe would be UY Scuti, a red supergiant, which resides 9,500 light years away from us. In 1860, it was discovered by German astronomers, and we later discovered its radius spanned over 1 billion kilometers or 621 million miles. The diameter is twice that!
As the diagram shows, that small orange glow is our sun. This is our sun to the solar system.
As you can see, our yellow dwarf is like a basketball to Earth’s peppercorn, and UY Scuti is a basketball to the sun’s peppercorn. The sizes involved are immense.
But UY Scuti only has around 10 solar masses, so if you’re looking for the heaviest star, give a round of applause for R136a1, a Wolf Rayet star. It minds its own business 163,000 light years away from Earth and has at least 250 solar masses.
So there you have it, people.
The biggest star would be UY Scuti and the heaviest star would be R136a1.
