Stars and planets that should not exist.

"A binary star system in the center of the Milky Way provides new clues as to how stars form around the central black hole. Credit: NASA/CXC/MIT/F.K.Baganoff et al."(ScitechDaily, A binary star system in the center of the Milky Way provides new clues as to how stars form around the central black hole. Credit: NASA/CXC/MIT/F.K.Baganoff et al.)

Our knowledge of planet and star formations expands. And that brings planets and stars that should not exist in front of our eyes. The thing that makes planet or star formation possible or impossible is the energy. And radiation that comes from the star. Or from the radiation center. The black holes and stars both cause particle flow and radiation that can destroy protoplanets or protostars that are too close to them. And, of course, the gravity field can rip protoplanets into pieces. 

Or why impossible star formation exists is simple. Those planets and stars can born somewhere else, and then the star or planet can travel to the orbiter of the gravity center. The rogue planet that comes to a star's or black hole's gravity field can start to orbit them. The same thing that fits stars fits planets. We know that pulsars have planets that formed probably in the supernova debris. 

"Artist’s illustration. Gaia detected this candidate exoplanet, named Gaia-4b, with astrometry. Now, follow-up spectroscopy has confirmed its existence. It’s about twelve times more massive than Jupiter and orbits the star called Gaia-4, around 244 light-years away. Credit: ESA/Gaia/DPAC/M. Marcussen" (ScitechDaily, A Star’s Tiny Wobble Just Revealed a Massive Planet That Shouldn’t Exist)

The planet called "Poltergeist" (PSR B1257+12 B) is one of those planets that orbit neutron stars. There can be millions of stars in the universe that orbit black holes. The most well-known binary star where a regular star's companion is the blue supergiant star Cygnus X-1. It's possible that the black hole captured the supergiant into its orbiter. Or anyway, the blue supergiant distance to the black hole can also turn smaller. 

The position with that other star was not the same in the case: Cygnus X-1's mass center collapsed into a black hole. There is a prediction or suspicion that the Cygnus X-1 is a binary star with a black hole component. In Cygnus X-1, the blue supergiant variable star HDE 226868 orbits some invisible object. The best candidate for that object is a stellar-mass black hole. The blue variable star is ending its existence as a star. And it will also turn into a supernova. 

If that invisible component of the Cygnus X-1 does not pull so much material out from that blue supergiant. Its mass will decrease below the critical point. And the result will be the neutron star. 

 That explains why that first supernova didn't destroy the blue supergiant. The interaction between those stars is interesting. The black hole pulls material from the blue supergiant but also sends radiation to that star. This means the blue supergiant is hotter than it should be, but it loses its mass, and that can affect its turn to explode as a supernova. 

And otherwise saying the entire galaxy orbits around the supermassive black hole. We can say that all stars in the Milky Way wait for their destiny. That destiny is to fall in the supermassive black hole Sgr*A which is the mass center of our galaxy. Another fate can be the case when Andromeda galaxy impacts our galaxy. That impact happened a couple of billions of years ago. And when that black hole travels through our galaxy it would destroy lots of stars and planets. 

https://scitechdaily.com/astronomers-just-found-a-star-system-that-shouldnt-exist-near-a-supermassive-black-hole/

 https://scitechdaily.com/a-stars-tiny-wobble-just-revealed-a-massive-planet-that-shouldnt-exist/

https://en.wikipedia.org/wiki/Cygnus_X-1

https://en.wikipedia.org/wiki/PSR_B1257%2B12_B