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  • Star Trails Photo from International Space Station

    Expedition 31 Flight Engineer Don Pettit relayed some information about photographic techniques used to achieve these images.

  • Star Trails Photo from International Space Station

    My star trail images are made by taking a time exposure of about 10 to 15 minutes.

  • Star Trails Photo from International Space Station

    However, with modern digital cameras, 30 seconds is about the longest exposure possible, due to electronic detector noise effectively snowing out the image.

  • Star Trails Photo from International Space Station

    To achieve the longer exposures I do what many amateur astronomers do.

  • Star Trails Photo from International Space Station

    I take multiple 30-second exposures, then ‘stack’ them using imaging software, thus producing the longer exposure.

  • Photo: Don Pettit/NASA_JSC_Photo on Flickr

    You can follow Pettit on Twitter at @Astro_Pettit.

  • Star Trails Photo from International Space Station

    For more star trail images, check out NASA_JSC_PHOTO on Flickr.

  • Star Trails Photo from International Space Station

    For more images from and of space, check out NASA's Image of the Day.

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