"There's another ingredient that's required, and that's the orbital economy, whether it happens in low-Earth orbit or on the lunar surface," Isaacman said.
The US is under pressure to return to the Moon. China is aiming for a lunar landing by 2030, and has been making steady progress towards this.
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The broadcast generated global headlines and much commentary on what happened and and how it could have been prevented.
Nick TriggleHealth correspondent