US Astronomer and dark matter pioneer Vera Rubin passes away

US Astronomer Vera Rubin, whose pioneering work on galaxy rotation rates led to the theory of dark matter passed away. She was 88. In 1974, Rubin had discovered that the stars at the edges of galaxies moved faster than expected. Her studies had earned her numerous honours, including being the second female astronomer to be elected to the US National Academy of Sciences. Dark matter is an unidentified type of matter that comprises approximately 27% of t mass and energy in the observable universe.