国际空间站上的星空

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2012-12-6 12:24 上传

http://www.theatlantic.com/infoc ... part-2-of-3/100419/

Star trails, city lights, and lightning strikes appear in this composite of a series of images photographed from a mounted camera on the International Space Station, from approximately 240 miles above Earth. Expedition 31 Flight Engineer (and photographer) Don Pettit: "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." A total of 18 images photographed by the astronaut-monitored stationary camera were combined to create this composite. (NASA/Don Pettit)

长时间曝光，每次曝光三十秒，然后多张照片合成。

s_y02_2e051505.jpg (169.22 KB, 下载次数: 8)

下载附件 保存到相册

2012-12-6 12:24 上传

http://www.theatlantic.com/infoc ... part-2-of-3/100419/

Star trails, city lights, and lightning strikes appear in this composite of a series of images photographed from a mounted camera on the International Space Station, from approximately 240 miles above Earth. Expedition 31 Flight Engineer (and photographer) Don Pettit: "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." A total of 18 images photographed by the astronaut-monitored stationary camera were combined to create this composite. (NASA/Don Pettit)

长时间曝光，每次曝光三十秒，然后多张照片合成。