A supernova explosion that skywatchers in the Far East observed almost 850 years ago has produced the most unusual remnant astronomers have ever found. "I've worked on supernovae for [decades], and I've never seen anything like this," says Robert.
Technology may have revealed a piece of the long-lost works of Greek astronomer Hipparchus, one of the greatest astronomers of antiquity. Around 130 BC, the great Greek astronomer Hipparchus drew up the very first star catalog ever, containing.