Yesterday, I attended the following presentation by Prof. Andrea Ghez. https://www.meetup.com/physicists/events/236886090/?gj=co2&rv=co2 In the Q&A session towards the end, there was a question she fumbled to give a proper answer. She mentioned that as long as the mass is compressed into within the Schwarzschild radius, any mass could turn into a black hole. She gave the exact presentation as in . See between 8:10-9:00. The question from the audience was, if an object travels at near speed of light, the mass increases, volume reduces. So, will a near light moving object create a black hole? https://www.quora.com/Relativity-physics-Does-relativistic-mass-have-gravity says the relativistic mass does have gravity.