Comet ISON has not survived its close encounter with the Sun. Time-lapse from NASA's Solar and Heliospheric Observatory shows the comet's head fading away, leaving only a dusty tail. A few hours later something - perhaps a small fragment or stream of debris - emerges from behind the Sun. Updates are continually being posted on http://spaceweather.com/.
Final views of Comet ISON from NASA's Solar and Heliospheric Observatory (SOHO) satellite, taken on the morning 29 November (AEDT).
Source: NASA/SOHO consortium
The environment of the Sun is a tough place for comets. ISON has been bombarded by heat and radiation, buffeted by the solar wind and also stretched by the Sun's gravity (think of a micro-version of a black hole's spaghettification). It's a love-hate relationship because comets need the Sun if they are to produce an impressive tail and put on a good show.
Comet ISON was discovered in September last year from Russia, by astronomers Vitali Nevski and Artyom Novichonok. Two things made this comet special - it would be the first time the comet would travel in towards the Sun from the outer solar system but, what's more, it would be a sungrazer, coming within 1.6 million kilometres of our star.
Northern hemisphere observers have been particularly interested, because if the comet had survived its passage, they would've had the best seats. From here in the south, the comet would not have been visible, unless it had erupted brightly enough to be seen during the day.
Comet ISON photographed on 15 November from the UK. Amateur astrophotographer Damian Peach used a 17-inch telescope for 12 minutes of combined exposures.
Image: Damian Peach
Source: Damian Peach
NASA's Solar TErrestrial RElations Observatory (STEREO) captured the solar wind buffeting Comet ISON and Comet Encke on 21 November.
Image: Karl Battams
Source: NASA, STEREO, CIOC