I've once heard a senior astronomer claim that anything beyond 20 meters is technologically not feasable. But I hope they'll overcome all the difficulties, because this is just too exciting!
Hence, "senior" - Just like the Victorian minds (18-19th century) told Einstein that he was full of crap. Although this is merely one example. In my opinion, life will perpetually continue to advance technology into more complex and astounding measures.
There are only the limits we set and make real, the universe knows of no such limits.
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