How do astronauts define “up” or “down” in space?

How do astronauts define “up” or “down” in space? Correct Answer There is no “up” or “down” in space

There is no “up” or “down” in space due to the lack of normal reaction forces for their weights. Gravity defines the vertical direction. Thus for the astronauts, all directions are the same.
Bissoy MCQ

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