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" ... Alternatives. The editorial board thinks private companies such as SpaceX and Blue Origin can offers better solutions for NASA’s human spaceflight needs. In reality, SpaceX founder Elon Musk has said that Falcon Heavy cannot be rated to carry humans into space. But even if it could be, Falcon Heavy has only a third of the lifting capacity of SLS, which would make missions to the Moon and beyond much more difficult. It is possible (although unlikely) SpaceX’s Starship concept might one day be human-rated, but that vehicle would require multiple refuelings in low-Earth orbit before heading to the Moon; SLS is designed to carry everything to the Moon—cargo, astronauts, etc.—without such complications. ... "
" ... But hydrogen fuel cells can be charged more quickly than batteries and they have a longer range. Nikola has developed two heavy-duty truck models, one with a range of 800 miles, the other with a range of 1,200 between refuelings. ... "
" ... Glenn made headlines on July 16, 1957 when he piloted an F8U Crusader supersonic aircraft from Los Alamitos, California, to Brooklyn, New York’s Floyd Bennett Field. And even with three precision mid-air refuelings en route, Glenn made the transcontinental trip in 3 hours, 23 minutes, and 8.3 seconds. ... "
" ... Other approaches would be more complicated, like requiring multiple refuelings in low-earth orbit, and thus reduce the likelihood of mission success. ... "
" ... The core problem with the refueling system is fixable, and soon. The only showstopper to date on KC-46 is the remote vision system that enables boom operators to perform refuelings from the cockpit area rather than lying in the rear of the aircraft. ... "