Am 30.04.2020 um 04:51 schrieb Craig Fink:
I thought there were a lot of other good points in the video, like long
term storage in-orbit or on the way to Mars should be as a Solid, not
Liquid or Gas. Like a cube-sat engine using liquid helium so the
hydrogen stays solid. I would think solid hydrogen encased in boiling
liquid helium would be reasonably safe to take to orbit in a 1U.
