RT @SkyandTelescope: How do we know black holes exist? Can we watch a black hole’s birth? Find out: listen to @mlthaller on Orbital Path… twitter.com/i/web/status/7…
RT @SkyandTelescope: How do we know black holes exist? Can we watch a black hole’s birth? Find out: listen to @mlthaller on Orbital Path… twitter.com/i/web/status/7…