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[i]My star trail images are made by taking a time exposure of about 10 to 15 minutes. However, with modern digital cameras, 30 seconds is about the longest exposure possible, due to electronic detector noise effectively snowing out the image. To achieve the longer exposures I do what many amateur astronomers do. I take multiple 30-second exposures, then 'stack' them using imaging software, thus producing the longer exposure.[/i] A total of 18 images photographed by the astronaut-monitored stationary camera were combined to create this composite: A total of 46 images photographed by the astronaut-monitored stationary camera in the Cupola were combined to create this composite: A total of 47 images photographed by the astronaut-monitored stationary camera were combined to create this composite:
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