It is because we stand on the Earth that we have a concept of up and down. We stand on firm land. So down is always solid, hard land.
Imagine yourself in dark space in a personalized "space capsule". Anywhere you look, you will find vast space ahead, upward, below and behind you. Without any reference point like Earth, there will be no up and no down......... or no direction for that matter! A really strange feeling unknown to us!
Hope you were able to imagine what I intended to convey.
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