Astronomers appear to have a heavenly crisis on their hands, and it concerns
First evidence of dark matter. By comparing the mass of all the known galaxies in
the Coma cluster with the gravitational glue required to keep the rapidly spinning
cluster intact, Fritz Zwicky showed in 1933 that most of the cluster’s mass must
be in some unknown, invisible form.
Log in
Subscribers, enter your e-mail address for full access to the Science News archives and digital editions.
