Vera Rubin, astronomer who helped find evidence of dark matter, dies at 88

Scientist from Philadelphia helped find powerful evidence of dark matter by discovering galaxies don't quite rotate in the way they were predicted

Vera Rubin, a pioneering astronomer who helped find powerful evidence of dark matter, has died aged 88, her son said on Monday.

She died on Sunday night of natural causes, Allan Rubin told the Associated Press. The professor of geosciences at Princeton University said his mother, a Philadelphia native, had been living in the Princeton area.