Quite a gem in today's @USGAO report on major NASA programs: Europa Clipper cost estimates went up by $250M. The reason? The spacecraft is ready by 2023 but no SLS available until 2025 (at the earliest). Congressional mandate means NASA can't legally choose another rocket. pic.twitter.com/aBgfdllKwp

— Casey Dreier (@CaseyDreier) April 29, 2020