what is the largest known star in our universe
But thatâs nothing. The largest known star is VY Canis Majoris; a red hypergiant star in the Canis Major constellation, located about 5,000 light-years from Earth. University of Minnesota professor Roberta Humphreys recently calculated its upper size at more than 1,540 times the size of the Sun.he noted that the largest stars are the coolest. So even though Eta Carinae is the most luminous star we know of, itâs extremely hot â 25,000 Kelvin â and so only a mere 250 solar radii. The largest stars will be the cool supergiants.