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Will rapid rocket reusability be demonstrated by 2021?
SpaceX Founder and CEO Elon Musk believes that a fully and rapidly reusable rocket is the pivotal breakthrough needed to substantially reduce the cost of space access.
SpaceX has had some significant successes in pursuit of this goal, but as of December 2018 has not yet demonstrated that it is possible to launch a payload to orbit, land a complete rocket or rocket stage and re-fly that asset within 24 hours, which Musk in 2018 claimed is a key milestone for rapid reusability. According to Elon Musk:
Our goal, just to give you a sense of how reusable we think the design can be, we intend to demonstrate two orbital launches of the same Block 5 vehicle within 24 hours, no later than next year.
Toward the end of next year we'll see the first Block 5 seeing [its] 10th flight. And like I said, next year is when we intend to demonstrate re-flight of the same primary rocket booster within — basically, same day re-flight of the same rocket. I think that's really a key milestone.
This question asks: before 1 January 2021, will any rocket stage or complete rocket be used to successfully complete its role in delivering any payload to orbit or an Earth-escape trajectory, land successfully on Earth (whether on land or at sea) and then re-flown on another orbital or Earth-escape mission, with the second liftoff taking place within 24 hours of liftoff of the first mission, and with the rocket or rocket stage landing successfully a second time?
Note that the vehicle in question need not be owned or operated by SpaceX - any qualifying instance of these events will result in a positive resolution.
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