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SpaceX Crew-3 launch of NASA astronauts: How to watch the rescheduled liftoff – CNET
The issue is not a medical emergency, according to NASA.

From left are NASA astronauts Kayla Barron, Raja Chari and Tom Marshburn, and European Space Agency astronaut Matthias Maurer in front of a Falcon 9 rocket at Kennedy Space Center in Florida.
SpaceX
The four astronauts of the NASA and SpaceX Crew-3 mission…
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