Scientists have discovered the most massive star yet, and its mass is 265 times that of our Sun, and may have been born at 320 times bigger. It’s known as R136a1. It would outshine the Sun as much as the Sun outshines our Moon. Up close, it would look fuzzy, instead of the clear disc in our sky. That’s because the star’s winds are so powerful they lose a lot of material. R136a1 is in a young cluster of close-together giants. Earlier, the largest bodies ever observed were just 150 times the size of the Sun. Now scientists wonder what the upper limits on size could be.