This artist's illustration shows a star exploding as a supernova. Astrophysicists caught the shock break out from a supernova 500 million light years away, the first indication of a massive stellar explosion. By detecting the break out, researchers were able to learn a lot about the progenitor and its surroundings.Astrophysicists have observed the x-ray breakout shock from a distant supernova for only the second time in the past couple of decades. Supernovae are known for lighting up the sky for months...