In the early 1930s, Swiss astronomer Fritz Zwicky noticed that many galaxies were moving far faster than their visible mass should permit. This unusual motion led him to propose that some kind of invisible structure — dark matter — was…
In the early 1930s, Swiss astronomer Fritz Zwicky noticed that many galaxies were moving far faster than their visible mass should permit. This unusual motion led him to propose that some kind of invisible structure — dark matter — was…