Dark Matter
DARK MATTER I ntroduction: D utch astronomer Jacobus Kapteyn first suggested the existence of dark matter in 1922 while studying stellar velocities . S wiss astrophysicist Fritz Zwicky inferred the existence of dark matter during his work on galactic clusters in 1933. He is also best in other works like Neutron stars ,Gravitational lensing ,Supernovae... T he late American astronomer Vera Rubin teamed up with the instrument maker Kent Ford in the 1960s ...