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I'm not sure exactly what pictures you're talking about, but I suspect its "pictures taken by astronauts on the International Space Station" or something like that.

When taking a picture, there are several variables that need to be adjusted to make it come out "good". One of them is shutter speed/exposure time. If this is too long, then the picture will be blurry. If it's too short, then the picture will be dark. The more brightly lit the subject, the shorter the shutter speed can be. Normally a short shutter speed is good because it makes the picture sharper.

If you go outside at night and take a picture of the sky (without doing anything special, like hooking the camera up to a telescope) you probably won't get any stars visible in the picture, other than possibly one or two very bright ones. This is because they're just not giving off enough light for the camera to register it in the time the shutter is open.

The same thing is true in space. The stars are brighter, but so is the Sun. If you're taking a picture of the brightly lit ISS, then the shutter speed needs to be very short to avoid overexposing it, and the stars won't show up in the picture.

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12y ago

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