Science Updates - A look at CfA discoveries from recent journals

Pleiades star cluster
January 22, 2021

The Pleiades star cluster, a brilliant collection of several hundred stars visible in the winter sky near the constellation of Orion, has been admired by people for thousands of years; it is cited in the Bible and the works of Greek authors.

Chandra X-ray Observatory in Earth orbit
January 15, 2021

Quasars are perhaps the best-known kinds of active galactic nuclei (AGN), galaxies whose central supermassive black holes are luminous, sometimes brighter than the rest of the galaxy.

ultraviolet image of the Sun showing a coronal hole
January 8, 2021

Sunspots were first seen by Galileo, and in the eighteenth century Rudolf Wolf concluded from his study of previous observations that there was a roughly eleven-year solar cycle of activity.