This introduction to radio astronomy also includes a spooky image of the galactic nucleus imaged by the VLA and chosen by Phil for his Halloween gallery.
I’m just going to quote Phil, who always manages to combine science and amusing writing:
THE MOURNING WOMAN AT THE MILKY WAY’S HEART
At the center of our Milky Way galaxy lurks a massive black hole, which, for the moment, is quiet. The surrounding material barely glows in radio waves, but there, off to the right… is that the baleful face of a woman, just a half a light year from the monster? Why is she sad? What is she mourning?
Perhaps she perceives her own fate: being twisted around, the gas making up her visage warped and wrapped as it circles that black hole over thousands of years, eventually, it may be, to take the final plunge into eterity.