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Relativity physics - When you talk about any Planet or Star and say that is 100 light years away from planet earth... Then no wonder many peoples Would think about what is
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
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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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Astronomical Distances by Ron Kurtus - Succeed in Understanding Astronomy: School for Champions
