What is the Largest Star?
Our Star Trek has taken us from the (relatively) small size of the Sun to nearby galaxies larger and larger stars. Our journey through the heavens has finally lead us to the largest known star, VY Canis Majoris located in the constellation Canis Major.
This star is 2200 times larger than our Sun. It is a red hypergiant star, and it is about 4,900 light years away from the Sun.
How big can stars get?
Is there an upper limit to how big a star can get? The current theories suggest that the upper limit is 150 solar masses, but this refers to the mass of a star. Beyond that astronomers have not been able to find any stars that have more mass.
On a different note, astronomers have observed that the largest stars are the coolest. Eta Carinae, for example, is the most luminous star that is known and it has an extremely hot temperature of 25,000 degrees Kelvin, yet it is only 400 solar radii. The largest stars happen to be the cool super giants. VY Canis Majoris is only 3,500 degrees Kelvin and it is 2200 times larger than the Sun. Bigger stars would be even cooler.