"What do astronauts do with Nitrogen on ISS(International Space Station), Is it brought just as water, or is there a way for it to be recycled?"
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Water Vapor Detected on Extrasolar Planet
An international team of researchers including members of NAI’s Virtual Planetary Laboratory Team have, using NASA’s Spitzer Space Telescope, detected the presence of water vapor on the hot jupiter HD 189733b. Published in this week’s Nature, the study’s primary author, Giovanna Tinetti, was a 2003 NAI Postdoctoral Fellow.
Source: [Link]
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