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Comet Lulin Photos - Comet Lulin C/2007 N3 brighten to naked eye visibility in February and March of 2009. This is another bright once in a lifetime comet as it will not return for another 2000 years. Captured on 02-21-09. This is a 93 minute exposure tracking on the nucleus of Comet Lulin, it shows both dust tail(left) and Anti-tail(right). The Green is color is a Poisonous gas called Cyanogen (CN2).