A grayscale image captured by the STEREO A spacecraft showcasing Comet McNaught. The comet's bright coma creates a horizontal stripe, while its dust tail stretches across a vast area (30 million kilometers). A fainter, neutral iron tail, a first-ever detection, is also visible. Bright Venus appears in the upper left corner.
Astronomy Picture from 04/05/2007
The Iron Tail of Comet McNaught
Source: https://apod.nasa.gov/apod/ap070504.html
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