Black Hole - It Is What It Ate | Video
How fast a super-massive black hole spins may indicate what it fed on and how often. NASA’s NuSTAR X-Ray Telescope is helping to decode the early life story of a nearby active galaxy by timing its rotation and measuring its glow.
Credit: SPACE.com / Guido Risaliti & Christopher Reynolds, Joint Space Inst. UM / Images: NASA / JPL / ESO