Observation Domes and powerful telescopes are builts in the clouds to study comets. As only 4% of light is reflected off the black comet rock, these cosmic rocks can be a little tricky to spot. Clip taken from BBC Documentary ' A Comet's Tale'. Watch more Comet's Tale videos with BBC Worldwide here: http://www.youtube.com/view_play_list?p=0E69828D29AD416B
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