Helen Sawyer Hogg-Priestly

Contributor

BIOGRAPHY

Professor of Astronomy, University of Toronto, 1957–76. Astronomy columnist, Toronto Daily Star, 1951–81.

Primary Contributions (1)

Centre of star cluster 47 Tucanae (NGC 104), showing the colours of various stars.Most of the brightest stars are older yellow stars, but a few young blue stars are also visible. This picture is a composite of three images taken by the Hubble Space Telescope.

Star cluster, either of two general types of stellar assemblages held together by the mutual gravitational attraction of its members, which are physically related through common origin. The two types are open (formerly called galactic) clusters and globular clusters. Open clusters contain from a…