The November 2 2022 issue of the journal "Monthly Notices Of The Royal Astronomical Society'' reports on the discovery of the nearest Black Hole ever found, it's just 1600 light years from Earth, that's 3 times closer than the next nearest one. It has nearly 10 times the mass of the sun but what makes it unusual is that it's a very calm and quiet Black Hole and is not producing any detectable X-rays or radio waves, apparently very little matter is currently falling into it. The hole was found by the wobble it induced in a G type star very similar to the sun, with the same metallic content and with 93% of the sun's mass, that is in orbit around the Black Hole.
Another unusual thing about it is the orbital period is186.6 days, and that's the longest orbital period ever found for a star orbiting a stellar mass Black Hole, and its orbit is also the most nearly circular of any ever found. The original star that produced the Black Hole must've had at least 20 solar masses and exploded in a supernova; so it's a mystery why the sun-like star that is now in orbit around the Black Hole looks so normal and why its orbit is so nearly circular considering the fact that it had to endure a very nearby supernova and the star it's orbiting suddenly lost half its original mass during the supernova cataclysm. A Sun-like star orbiting a black hole <https://academic.oup.com/mnras/advance-article-abstract/doi/10.1093/mnras/stac3140/6794289?redirectedFrom=fulltext&login=false> John K Clark See what's on my new list at Extropolis <https://groups.google.com/g/extropolis> sle -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAJPayv3egGyf4HLdrtiCLF%3D01TdYxj%3DrrykbtM99NMaa559qZQ%40mail.gmail.com.
