When you hear the word "superstar," you think of someone like, say, Michael Jordan or some box office giant. I'm sorry, but that's a pretty lame use of the word when you hear about the kind of star astronomers have recently discovered. It is the largest known star in the universe! Conventional telescopes had missed it because of vast dust clouds. But the Hubble space telescope picked it up. And it's 186 million miles wide and 10 million times brighter than the Sun! That's a superstar. Don't even try to comprehend one star that enormous! Interesting footnote - according to many theories on how stars are formed, a star this large is an impossibility! No, it's not.