“That amorphous blight of nethermost confusion which blasphemes and bubbles at the center of all infinity—the boundless daemon sultan Azathoth”–The Dream-Quest of Unknown Kadath, by H.P. Lovecraft. 1927 [Emphasis mine]
“Two huge bubbles that emit gamma rays have been found billowing from the center of the Milky Way galaxy, astronomers have announced.”–National Geographic, November 10 2010.
Then there’s also this matter to consider, which seems innocuous enough until you see the picture on this page.