Zwicky is the first person to coin the word supernova, the Swiss astrophysicist used the new term in 1934 to describe a class of stellar that were different in their size and make-up from the novae that we known of at the time. He made it apparent that there was a connection between supernovae and neutron stars, over 30 years before the first neutron stars were discovered. Zwicky was studying the Coma cluster of galaxies in 1933 when he realized that the individual galaxies were travelling at such great speeds that they should have escaped a long time ago; the fact that they had not brought him to the conclusion that there must be more matter in the universe than we can see, this unknown matter was sometimes called the ‘missing mass – it is now know as dark matter.