# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2016-12-26 23:42:25 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/813530437637156864) RT @NPR: Vera Rubin, Who Confirmed Existence Of Dark Matter, Dies At 88 https://t.co/K7p3abBhwl