The Coolest Flickr Photo Set Ever

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NASA astronaut Don Pettit took some photos from the International Space Station that were posted on Flickr and called ISS Star Trails. In short, they're incredible and it's pretty cool reading how he created them:

“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.”

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