Elon Musk is about to test the 'trickiest' part of his Mars spaceship — a giant, potentially explosive black orb
'The hardest part of the spaceship'
- "The flight tank will actually be slightly longer than the development tank shown, but the same diameter," Musk said.
- He also said it was "built with latest and greatest carbon fiber prepreg," or carbon fiber that's pre-impregnated with a resin to make it tougher. "In theory, it should hold cryogenic propellant without leaking and without a sealing linker," he said. "Early tests are promising."
- Finally, he teased a much grander test: "Will take it up to 2/3 of burst pressure on an ocean barge in the coming weeks."