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We now know why SpaceX’s lat­est Star­ship pro­to­type went up in flames last week.The stain­less-steel vehi­cle, known as SN11 (“Ser­i­al No. 11”), launched on a test flight last Tues­day (March 30) from SpaceX’s South Texas facil­i­ties, near the Gulf Coast vil­lage of Boca Chi­ca. SN11 soared to a max­i­mum alti­tude of 6.2 miles (10 kilo­me­ters) as planned, and the 165-foot-tall (50 meters) craft checked a num­ber of box­es on the way down as well. But SN11 did­n’t stick its land­ing, instead explod­ing in a mas­sive fire­ball — because of a plumb­ing prob­lem, SpaceX founder and CEO Elon Musk announced today (April 5).Video: Watch SpaceX’s Starship …