emo324#at number 8 is the direct confirmation of the mysterious dark matter in the summer of 2006. The unprecedented evidence came from the careful weighing of gas and stars flung about in the head-on smash-up between two great clusters of galaxies in the Bullet Cluster. Until then, the existence of dark matter was inferred by the fact that galaxies have only one-fifth of the visible matter needed to create the gravity that keeps them intact.

So, the rest must be invisible to telescopes: That unseen matter is Dark...