曝光的天空被旋转着以补偿地球的自转，然后把一连串的图像叠放在一起，产生了与单一曝光相同的图像，可是很少有数码噪声。
The sky in the exposures was de-rotated to compensate for the rotation of Earth, then images were stacked together producing an image identical to a single exposure but with less digital noise.
绝大多数的数码相机都能曝光30秒而不会产生过多的噪点，这是一个很好的起点，这个曝光时间也可以避免拍下星星因地球自转产生的轨迹。
Most digital cameras can easily a handle a 30-second exposure before noise starts getting out of hand. That's a great place to start.
银河的广袤在这些图片里展示得淋漓尽致，他只用了一个三脚架和一架普通的数码相机就拍到了离地球2万5千光年远的星星。
The enormity of the Milky Way is shown in these stunning images, captured using only a standard digital camera and tripod, of stars 25,000 light years from Earth.
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