The writer had fun with this paragraph. I know stories like these in the general press are ragged on often (rightfully), but seriously? Would a writer in the Politics or Business sections ever get something like the 2nd sentence past their editor?

The source of the bubbles is a mystery. One possibility is that they are fueled by a wave of star births and deaths at the center of the galaxy. Another option is a gigantic belch from the black hole known to reside, like Jabba the Hutt, at the center of the Milky Way. What it is apparently not is dark matter, the mysterious something that astronomers say makes up a quarter of the universe and holds galaxies together.