Europa Clipper was supposed to fly on SLS. That not happening saved several billion dollars. SLS is a fat disgusting barrel of pork that should be canceled and hidden for the sake of NASA's own reputation, not to mention taxpayers. If they continue with SLS when Starship is in serial production and flying regularly, it will make NASA look like one of the most inefficient and corrupt organizations in American history. It will be NASA's own neck on the chopping block if they don't distance themselves from SLS soon.