From my new favorite website, The Daily Galaxy:

Cosmological calculations indicate that the vast array of objects we can detect are just foam on top of a vast invisible sea of matter we can’t detect, and two teams think the key to the undetectable lies in our very own star.

Foam on top of a vast invisible sea—I’ve been saying that for years. More on dark matter, and lots of great images, not including the key to the undetectable, over here.