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"@ ac14112
No, not the only one, just one of the few ...
You are correct sir (or madam as the case maybe)
http://en.wikipedia.org/wiki/Gaia_%28Foundation_universe%29
Gaia was the planet sized "seed" from which Galaxia would/did grow (is growing?)
So ..."
TrilbyNangified commented on The Largest Mega-Sentients In The Entire Universe
http://io9.com/386903/