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URL copied Image Source : PTI/REPRESENTATIONAL Scientists from Sweden, Spain, the US, Ukraine, and India investigated an early form of photography that used glass plates to capture night sky images. An international collaboration of astronomers has identified a curious occurrence of nine star-like objects that appeared and vanished in a small region within half an hour on an old photographic plate. Astronomers collaborating across countries track vanishing and appearing celestial objects by comparing old images of the night sky with new, modern ones, register unnatural phenomena and probe deep into such phenomena to record changes in the universe. Scientists from Sweden, Spain, the US, Ukraine, and India, including Alok Gupta from the Aryabhatta Research Institute of Observational Sciences, Nainital, investigated an early form of photography that used glass plates to capture night sky images of April 12, 1950, exposed at the Palomar Observatory

United statesCanary islandsSpain generalBeatriz villarroelGran telescopio canariasAlok guptaDepartment of scienceAryabhatta research institute of observational sciencesNordic institute of theoretical physicsImage sourceAryabhatta research instituteObservational sciencesPalomar observatoryNordic instituteTheoretical physicsInstituto de astrof