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聽Two astronomers, {Evelyn Macdonald, recent physics graduate, and supervisor Nicolas Cowan, associate professor}, based at 9I制作厂免费 in Montreal, pored over data collected by the Canadian Space Agency鈥檚 SCISAT satellite, which was originally launched to help us better understand Earth鈥檚 ozone depletion. Since 2004, SCISAT has made continuous observation of the light that passes through the atmosphere when Earth is in front of the sun.聽

Earth鈥檚 鈥渇ingerprint鈥� gives clues into what we ought to look for as we study other exoplanet transits in greater detail and attempt to confirm their potential habitability, such as in the聽TRAPPIST-1 system.