Dark matter spotted?

I'm not too good at explaining or summarizing theoretical or experimental physics that I myself barely comprehend (to put it generously), so I'll instead quote the fine science writers at MSNBC:

In a new finding that could have game-changing effects if borne out, two astrophysicists think they've finally tracked down the elusive signature of dark matter.

This invisible substance is thought to make up much of the universe but scientists have little idea what it is. They can only infer the existence of dark matter by measuring its gravitational tug on the normal matter that they can see.

Now, after sifting through observations of the center of our Milky Way galaxy, two researchers think they've found evidence of the annihilation of dark matter particles in powerful explosions.

You can read the whole article about this exciting discovery here. The diagram above details the hypothetical composition of the known universe. As you can see, most of it is dark energy and dark matter.