Media playback is unsupported on your device

Hopes rise for 'dead' Comet Ison

29 November 2013 Last updated at 10:29 GMT

Comet Ison, or some part of it, may have survived its encounter with the Sun, according to scientists.

The giant ball of ice and dust was initially declared dead when it failed to re-emerge from behind the star with the expected brightness.

But recent pictures have indicated a brightening of what may be a small fragment of the comet.

The BBC's Pallab Ghosh reports.

Copyright © 2015 BBC. The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.