If a star explodes and no one sees it, is it visible?

Scientists (astronomers and astrophysicists, actually) announced last week that a star in a heretofore unknown galaxy exploded about 7.5 billion years ago. The light from the explosion finally reached earth last Wednesday, about 2:12 a.m. (presumably EDT). The exploding star, situated about half way to the edge of the known universe, was the brightest gamma… Continue reading If a star explodes and no one sees it, is it visible?