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_Astronomy版 - Astronomy Picture of Day: Comet SWAN Outburst
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发帖数: 1994
1
Comet SWAN Outburst
Credit & Copyright: Paolo Candy
Explanation: Near its closest approach to planet Earth, comet SWAN (C/2006
M4) brightened unexpectedly earlier this week, becoming visible to naked-eye
observers under dark night skies. Telescopic observers also noticed
dramatic changes in the comet's colorful coma and tail, seen in this view
recorded on October 25th. To make the picture, images totaling eight minutes
in exposure time were stacked and centered on the comet as it moved
relativel
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