The windows are triple-pane, the redundancy being driven by safety concerns. So far NASA has tested replacing just one pane with an acrylic, but since that swap was successful in initial testing, a second pane will soon be swapped out. It doesn't appear that replacing all three panes is under consideration at this point in time.
Every time I read about plastics in space though, I have to shudder thinking about what the radiation (mostly gamma) will do to the poor plastic. I've blogged in the past (1, 2 and 3) about using plastics as a radiation shield, and the surprisingly positive results, so I know that the plastic can endure, but still...
I hope all goes well with this program. It would be exciting to see people leave earth orbit again (yes, I'm old enough to remember seeing the Apollo launches and Armstrong's walk). That no one, from any country in the world, has done this in over 40 years is pretty surprising.
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