an interactive & quite extensive size comparison of the perception of our universe, starting from a proton (1 femtometer) over to a hydrogen atom (100 picometers), a protein nanometer (10 nanometer), & a red blood cell (7-8 micrometer), to the moon (3,764km), a nebula (30 light years), & the outer limits of our universe (13,7 billion light years).
LINK [Universcale]
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