itsfullofstars:

International Space Station Star Trails

Expedition 31 Flight Engineer Don Pettit relayed some information about photographic techniques used to achieve the images: “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.”

Star trails andEarth light trails!

Reblogged 9 months ago from itsfullofstars (Originally from crookedindifference)
705 notes
Tagged: space!, ISS, Space Art, Star trails, .
Source: Flickr / nasa_jsc_photo
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