Y0 (other)
Y0 may refer to: * year 0, first year * Y0 class, a star class with brown dwarfs * Yakuza 0 ''Yakuza 0'' is an action-adventure game developed by Ryu Ga Gotoku Studio and published by Sega. It is the sixth main entry in the '' Yakuza series'' and a prequel to the original game. It was released for PlayStation 3 and PlayStation 4 in J ...

Year 0
A year zero does not exist in the Anno Domini (AD) calendar year system commonly used to number years in the Gregorian calendar (nor in its predecessor, the Julian calendar); in this system, the year is followed directly by year . However, there is a year zero in both the astronomical year numbering system (where it coincides with the Julian year ), and the ISO 8601:2004 system, the interchange standard for all calendar numbering systems (where year zero coincides with the Gregorian year ; see conversion table). There is also a year zero in most Buddhist and Hindu calendars. Historical, astronomical and ISO year numbering systems Historians The ''Anno Domini'' era was introduced in 525 by Scythian monk Dionysius Exiguus (c. 470 – c. 544), who used it to identify the years on his Easter table. He introduced the new era to avoid using the '' Diocletian era'', based on the accession of Roman Emperor Diocletian, as he did not wish to continue the memory of a persecutor ...
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Brown Dwarf
Brown dwarfs (also called failed stars) are substellar objects that are not massive enough to sustain nuclear fusion of ordinary hydrogen (hydrogen-1, 1H) into helium in their cores, unlike a main sequence, main-sequence star. Instead, they have a mass between the most massive gas giant planets and the least massive stars, approximately 13 to 80 Jupiter mass, times that of Jupiter (). However, they can deuterium burning, fuse deuterium (deuterium, 2H), and the most massive ones (> ) can lithium burning, fuse lithium (lithium-7, 7Li). Astronomers classify self-luminous objects by spectral classification, spectral class, a distinction intimately tied to the surface temperature, and brown dwarfs occupy types M, L, T, and Y. As brown dwarfs do not undergo stable hydrogen fusion, they cool down over time, progressively passing through later spectral types as they age. Despite their name, to the naked eye, brown dwarfs would appear in different colors depending on their temperatur ...
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