19 November 2013
NASA, the Canadian Space Agency, the ESA, and JAXA will mark the 15th anniversary of the ISS today with a worldwide wave on Twitter. The four space agencies are expected to issue 24 tweets related to the space station in 24 hours — one every 60 minutes at the top of every hour, starting at 7 p.m. EST under the hashtag #ISS15. (Image Credit: NASA)
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