stellar astronomy

Stars light up the night sky. But as we saw a couple of weeks ago, not all stars are the same. Thanks to the Hertzsprung-Russell diagram, we can easily see that there is a relationship between the surface temperature of a star and the star’s luminosity. This relationship can tell …

If you’re like me, you’ve sat outside on a warm summer night, watched the darkness rise, and count the stars as they popped onto the night sky seemingly out of nowhere. They look more or less the same, but if you’re in a really dark location, you start to notice …