A comet is an icy body that releases gas or dust. They are often compared to dirty snowballs, though recent research has led some scientists to call them snowy dirtballs. Comets contain dust, ice, carbon dioxide, ammonia, methane and more.
NOTE: Above information has been taken from wikipedia and/or official websites of topics.
The most fascinating news came close to home with the landing of the Rosetta spacecraft on comet 67P ...DetailsMore Videos