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In this image of the Large Magellanic Cloud from the Spitzer space telescope, there's a straight line of red stars in the bottom right corner (much easier to see if you go to the link and open the full resolution, but that's a 58 MB image):

Line of red stars in image of Large Magellanic Cloud

This seems to me unlikely to be represent the actual physical reality. The description states

This picture is a composite of infrared light captured by Spitzer. Light with wavelengths of 3.6 (blue) and 8 (green) microns was captured by the telescope's infrared array camera; 24-micron light (red) was detected by the multiband imaging photometer.

Is this just an effect due to the underlying images which were composed together covering different areas?

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