Black Sabbath 's star-studded Back To The Beginning extravaganza - which featured both the last-ever performance from the legendary quartet's original line-up and a final bow from frontman Ozzy ...

Surprisingly lightweight and inky-black, jet is one of the oldest known gemstones, and has been carved and shaped by the artistically inclined since the Neolithic era (7,000-1,7000 B.C.).

Even more surprisingly, the black hole that powers the quasar from which this jet erupts, designated J1601+3102, is relatively small. (For a quasar-powering supermassive black hole, that is.

Astronomers used Chandra and the Karl G. Jansky Very Large Array (VLA) to study this black hole and its jet at a period they call "cosmic noon," which occurred about 3 billion years after the ...

And it's not at all clear why a black hole's jet would alter that regularity. So, some of the people involved in the first study got time on the Hubble to go back and have another look.