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Light years and Units for the Stars

Space is Big. Really Big." The Hitchhiker's Guide to the Galaxy pretty much nailed space with those five words. And space is so really big that our earthly measures of distance struggle. The distance to the sun? Just under 150 million kilometres. The distance to the nearest stars? They are more than 4x10^13 kilometres away. And if you aren't familiar with scientific notation, that's 40,000,000,000,000 kilometres, or 40 trillion kilometres. Almost everyone struggles with numbers so unbelievably big, including astronomers. Could you memorise that the Large Magellanic Cloud is 1.5x10^18 kilometres away? I start losing track somewhere around the 14th nought. So, to cope with the overwhelming bigness of space, astronomers have devised a series of really big units. #lightyear #universe #parsec