Discover the Hertzsprung-Russell diagram, a key tool graphing the brightness of stars against color in astronomy. That's really funny, and I wish I had thought of it. The vertical axis is fame, as ...

In the hearts of some massive galaxies lie strange objects known as quasars. These mysterious objects were named for their apparent similarity to stars (quasar is short for ‘quasi-stellar radio source ...

A: To determine the age of a globular cluster, astronomers rely on the assumption that all the stars in the cluster formed at the same time and are the same distance from us. But the stars don’t all ...