I am trying to understand what this sentence means. Is it saying that the Europa orbiter is the only mission without the legal permission to fly?
Double negatives ... means it must be flown.
How about this however:
MILES O’BRIEN: Culberson isn’t stopping there. He has written a 50-year plan for NASA that includes a spacecraft that can go 10 percent the speed of light for humanity’s first interstellar mission to the nearest Earth-like star. The launch date is 2069, 100 years after the first moon landing.