Webb telescope spots universe's biggest stars

An image of Messier-15, a globular cluster home to up to a million tightly packed stars

PARIS - The James Webb Space Telescope has helped astronomers detect the first chemical signs of supermassive stars, "celestial monsters" blazing with the brightness of millions of Suns in the early universe.

So far, the largest stars observed anywhere have a mass of around 300 times that of our Sun.