For example, if something would be a few light years wide, would that not mean we would have to use a thing to map it out for that amount of light years in years to get the actual map? Or do they use different methods, like scaling things close to it?
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They can also use the relative movement from different parts of the Earth’s orbit to estimate distance. See [Parsec](https://en.wikipedia.org/wiki/Parsec)
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