The astronaut Don Pettit is responsable for some of the most impressive pictures of the space. The pictures were took during Expedition 31, about 240 miles from the Eath.
When asked how he produced such amazing pictures, Don Pettit said: "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."
All Don Pettit's pictures taken from orbit can be seen on the collection "Star Trails". Click here to see the whole collection.
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