Without Doctor Manhattan or Veidt around for a confession, such a discovery would likely be as jarring (if not as deadly) as the squid monster.
This is perhaps the most superfluous of all the questions here, since it doesn’t involve any actual human characters.
The domed-up manor would be enough to shake up the astronomy world, but the kicker would be the “Save Me Daughter” message formed by hundreds of Mr. Phillips and Ms. Crookshanks’ cloned corpses, not to mention the multitude of servants still residing there.
Still, I’m vastly intrigued by the risk of a global space agency (that isn’t funded by Trieu Industries) unwittingly discovering Veidt’s glass-half-empty utopia first created by Doctor Manhattan.