Comet ISON, once touted as a top candidate for comet of the century, appears to have fragmented during its swing past the sun last week. Though some NASA images initially suggested that ISON had survived the close encounter, experts now think this wasnt the case. Instead, they believe that ISON has largely disintegrated, leaving only a dusty cloud in its wake. Never one to follow convention, ISON lived a dynamic and unpredictable life, alternating between periods of quiet reflection and violent outburst, wrote astrophysicist Karl Battams in a rather dramatic obituary for the comet on NASAs ISON observation website.