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2 answers

Carbon Fibre mainly. There's a few others but this is light and strong.

2006-09-06 09:17:02 · answer #1 · answered by Mark G 2 · 0 0

There are none beyond some theory's. In space travel we are in the model T .

2006-09-05 11:32:54 · answer #2 · answered by JOHNNIE B 7 · 0 0

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