The International Space Station gets it supplies from an ever-growing array of unmanned cargo ships, including the Japanese HTV, the European ATV, the Russian Progress, and the commercial Dragon that just rendezvoused with ISS after a brief thruster scare. There are yet more on the way, with the next ship to launch being Orbital Sciences’ Cygnus demonstration mission, now that ATV-4’s flight got bumped due to an avionics glitch.
Who can keep them all straight? Well, this handy chart, courtesy of RIA Novosti, might help. Check it out (click to expand):
![A trajectory analysis that used a computational fluid dynamics approach to determine the likely position and velocity histories of the foam (Credits: NASA Ref [1] p61).](http://www.spacesafetymagazine.com/wp-content/uploads/2014/05/fluid-dynamics-trajectory-analysis-50x50.jpg)
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