28/01/1993 American astronomer Helen Sawyer Hogg dies
Helen Sawyer Hogg Presentation
She is noted for pioneering research into globular clusters and variable stars. A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite. Hogg photographed the clusters and looked for variable stars in them. Some of them can be used from measuring the distance.
Explore contextually related video stories in a new eye-catching way. Try Combster now!