Reproducibility forms one of the cornerstones of physics; independent scientists need to corroborate a finding before it's widely accepted in the scientific community. But sometimes the window of observation only lasts for several hours twice every hundred years or so. That makes reproducibility fairly difficult. Earlier this summer, Venus passed in front of — or transited — the sun for the last time this century. While the astronomical event amazed viewers across the world, a group of physicists were re-creating an observation from over 250 years ago: the discovery of Venus' atmosphere. At the same time, they've stoked the fire in a debate over who first made this discovery. The entire Venus transit of 2012 in one image. Image courtesy of NASA.
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