Vera Rubin has died
It's probably worth noting that the strongest proof of dark matter are observations of the bullet galaxy, which Vera Rubin was not involved with as far as I can tell. Some kinds of MOND (which tries to avoid the need for dark matter to explain the current state of the universe) purports to be able to explain Rubin's observations, although they cannot yet explain the bullet galaxy.<p>I mention this because "confirmed" is a strong word for something that we still have very little direct evidence for, other than observing the proper motion of galaxies. That's pretty strong evidence, but it'd be really cool to be able to detect the stuff directly.