Word: differet
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...system used in discovering variable stars is very successful. There is in the observatory a library, so to speak, of the sky for the past eight years. During this time nearly 60,000 photographs of the skies at differet times have been taken. As soon as a star is noticed with hydrogen lines on its spectrum, a reference is immediately made to the photpraphs made in that region where the star is found. From these different photographs it can be learned whether the star is always of the same brightness. This method leads to the discovery of more variable stars...
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