• [2012-08-28] NRL researchers observe bright arctic clouds formed by exhaust from final space shuttle launch
  + http://climate.nasa.gov/news/index.cfm?FuseAction=ShowNews&NewsID=771
  in Tietoukka Monitor > 2012 > 2012-35 with polar_mesospheric_clouds space_traffic
• [2013-07-08] ScienceShot: Rockets Are Seeding the Skies With Clouds
  + http://onlinelibrary.wiley.com/doi/10.1002/grl.50540/abstract
  in Tietoukka Monitor > 2013 > 2013-28 with polar_mesospheric_clouds

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