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861.460 light years is about 999,999,999,999,999,983,222,784 times as long as a Red Blood Cell
In other words, it's 1,099,999,999,999,999,874,170,880.000000000000000000000000000 times the length of a Red Blood Cell, and the length of a Red Blood Cell is 0.000000000000000000000000910 times that amount.
(a.k.a. RBCs, a.k.a. haematids, a.k.a. erythrocyte, a.k.a. erythroid cells, a.k.a. red blood corpuscles)
An average Red Blood Cell measures 7.5 ┬Ám (micrometers) in diameter. An average human has 20 - 30 trillion red blood cells in their body and each cell completes a circulatory lap in about 20 seconds.
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