Throughout human history, comets have been seen as intensely meaningful, and as such have been the subject of intense study from ancient philosophers, priests, astrologers and scientists. Though often comparable in size to asteroids, comets have a tail made of gas and dust, emitted by an icy-cold nucleus of comparable material that forms the bulk of their mass.
Now, thanks to observations from the Hubble Space Telescope, scientists have discovered a unique specimen: the most massive comet ever found, with the largest icy nucleus even seen.
