What Types of Extreme Stars are There in the Universe?

References White Dwarf - COSMOS https://astronomy.swin.edu.au/cosmos/W/White+Dwarf White Dwarf - Wikipedia https://en.wikipedia.org/wiki/White_dwarf Electron Degeneracy Pressure - COSMOS https://astronomy.swin.edu.au/cosmos/E/electron+degeneracy+pressure Pauli Exclusion Principle and Atomic Energy Levels - Khan Academy https://www.khanacademy.org/science/physics/quantum-physics/atoms-and-electrons/v/atomic-energy-levels Orbital Energy States - LibreTexts https://chem.libretexts.org/Bookshelves/General_Chemistry/Map%3A_Chemistry_(Zumdahl_and_Decoste)/07%3A_Atomic_Structure_and_Periodicity/12.09%3A_Orbital_Shapes_and_Energies How Long Does it Take for a White Dwarf to Become a Black Dwarf? - Astronomy https://astronomy.com/news-observing/ask%20astro/2004/12/how%20long%20does%20it%20take%20for%20a%20white%20dwarf%20to%20turn%20into%20a%20black%20dwarf Core Collapse - COSMOS https://astronomy.swin.edu.au/cosmos/c/core-collapse Photodisintegration - COSMOS https://astronomy.swin.edu.au/cosmos/P/Photodisintegration Types of Neutron Stars - Wikibooks https://en.wikibooks.org/wiki/Pulsars_and_neutron_stars/Neutron_star_properties Hypothesized Magnetar Formation Process - European Southern Observatory https://www.eso.org/public/news/eso1415/ Low Mass X-Ray Binary - COSMOS https://astronomy.swin.edu.au/cosmos/L/Low-mass+X-ray+Binaries High Mass X-Ray Binary - COSMOS https://astronomy.swin.edu.au/cosmos/h/High-mass+X-ray+Binaries Neutron Stars - University of Maryland (touring this school in summer 2021) https://www.astro.umd.edu/~miller/nstar.html Quark Star - Wikipedia https://en.wikipedia.org/wiki/Quark_star