Comets are colourful fuzz-balls in space that have a small rocky nucleus, a shimmering hallo of dust known as the coma, and a long dusty tail stretching thousands of miles in length. They have been seen by sky watchers for centuries, and were once believed to be omens to bad fortune.
Over the last decade, a number of spacecraft have visited comets, and have helped to reveal their secrets, in this month's program we look at some of their findings to help better understand the discoveries that await us from Rosetta over the next year.
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