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Loading contentA free program that automates the registration and stacking of deep-sky exposures together with their calibration frames, producing a single high-signal image ready for final processing. Its simplicity has made it a popular first step in many deep-sky imaging workflows.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.