the largest structure in the observable universe is called the LQG (large quasar group) and spans roughly 4 billion light years end-to-end.
[url]http://www.sciencedaily.com/releases/2013/01/130111092539.htm[/url]
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Damn, that's large
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To gain a bit of perspective: If we were on one end of the LQG when the first anaerobic life formed in the earths primordial oceans, light from the far end would likely not yet arrive for 100 million years given current estimates.