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Is that right? No. It is easy to correct for biases in pixel sensitivity, these objects are stars and the telescope tracks them such that their light is collected into the same photon bin over time. Correction for pixel sensitivity is generally done (own experience) by taking images completely out of focus in faint light conditions. In this way one assures ...


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Is that right? No. The streaks are fast-moving objects in the view of the telescope -- Other satellites. Hubble is in a fairly low orbit (it can be visited) and there are plenty of satellites around and above it, including in its field of view. (For obvious reasons, the streaks are not caused by aeroplanes, a usual contender for streaks). What gives it ...


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Is that right? Yes. Is the fuzzy one an extended object? That would certainly be my guess (probably a distant galaxy). What causes so many isolated pixels to be so much brighter than the background? Is this just the tail of a statistical distribution of shot noise, or are there other mechanisms that can produce single pixel noise many ...


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