How exactly does one make a map of a quarter of the universe when we haven't even left our own Solar System yet?
Not saying this is fake, I'm just curious.
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Haven't opened the link (still at work and not keen on using phone ) As for your query I'm guessing radio telescopes for the 'tangible' part and mathematics for the rest.
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Probes.
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Giant telescopes I would imagine
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Of course! How could I have missed it?