For some perspective: @spacex's proposed Mars rocket can launch up to 550 tons. The ISS weighs 500 tons.
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Replying to @nateberkopec
It took 15 spaceflights to assemble the ISS. The
@spacex Interplanetary Transport System can
it in a single flight with 50 tons to spare.3 replies 4 retweets 3 likes
Replying to @nateberkopec
Well that and cost.
6:27 PM - 1 Oct 2016
from Ottawa, Ontario
0 replies
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