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Despite supercomputing powers, physical testing is needed to know whether spacecrafts can deal with the air pressure when re-entering the earth atmosphere.
The NASA Ames supercomputer can perform 61 trillion operations per second, making it the fourth most powerful computer in the world. Besides spacecraft development it is used for hurricane forecasts and predict the merging of black holes.
There used to be 26 wind tunnels at the NASA Ames Research Center, now only two remain. Most of the tests have been replaced by computer simulations.