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Earth Shaker - #AstroMeme How far is far? We often measure distances in space using astronomical units (AU) and light-years (ly) because of the superb distances. 1 Astronomical Unit (AU) - average
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Retired physicist seeks to abolish light-years and astronomical units in favor of SI units like the petameter (1 followed by 15 zeros), zettameter (21 zeros), and yottameter (24 zeros). : r/Astronomy
