Astronomers examined a massive star two-and-a-half years before it exploded into a supernova. At the end of their lives, cool, yellow stars are typically shrouded in hydrogen, which conceals the star’s hot, blue interior. But this yellow star, located 35 million light-years from Earth in the Virgo galaxy cluster, was mysteriously lacking this crucial hydrogen layer at the time of its explosion.
Click here for original story, ‘Oddball supernova’ appears strangely cool before exploding
Source: ScienceDaily