? Smithsonian Institution Animations courtesy NASA/GSFC The atmosphere has been changing since Earth began. Once living things evolved the ability to carry out photosynthesis, perhaps 2.7 billion years ago, they began to remake the atmosphere. Explore the invisible envelope that surrounds us and see how our changing atmosphere is unique within our Galaxy. Learn more about our atmosphere by visiting the online exhibition, Change is in the Air at: http://forces.si.edu/atmosphere
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