Comment: I'd guess 100+ Billion

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I'd guess 100+ Billion

And its likely the last to ever be built, the LHC is built on top of an older smaller collider, which is also built on top of an even older, smaller one... Each increase in size is defined by a specific math formula that states the increase in size is exponential. I'm not sure how many more upgrades they could still do and remain on earth but I believe it was 2 BEFORE the LHC. So this next upgrade is likely the largest that can be built on earth, the next upgrade after that would be around the orbit of the moon or so, and then after that the entire solar system. I believe I saw this on a Ted Talk prior to the LHC coming on-line.