This is a fantastic savings for NASA, but also a very challenging concept for NASA legal and procurement," NASA astrophysics program manager Barbara Grofic wrote in a December 2022 email obtained by NPR.
And a retired Hubble operations expert named Keith Kalinowski who helped evaluate the plan wrote that while he'd be in favor of a "well-planned" mission to service the orbital outpost, Isaacman's plan was "unnecessary and risky."
"SpaceX's view of risks and willingness to accept risk is considerably different than NASA's," said Dana Wiegel, the current program manager for the International Space Program.
"The other issue is the need for reboost now versus later," wrote astronaut John Grunsfeld, who performed numerous previous repairs to the Hubble. "Perhaps the opportunity with Polaris won't be there, but NASA can work with Congress and the Administration."
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