Well hello dere mammy! Dark Comets are coming! (a bad "black face" joke)...
http://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html
The serious point here is that we can't see these with regular optics. So it's a damn good thing that we have satellites looking across just about all spectrums. Most comets are actually found because they block out known stars light as they pass by. I am not so worried.
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