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Atlas V vs. SLS Launch on the Space Launch System (SLS) booster currently being developed by NASA primarily to support human exploration would significantly shorten the flight time to Jupiter. Other presentations list the nominal cost for an Atlas launch at ~$350M and for an SLS launch at ~$500M. Reducing the cost of operations during the flight to Europa could make the SLS option, which is currently required by law, equal to or cheaper than the Atlas option. NASA / JPL-Caltech