Old Earth monotheistic religion based on belief in one God and Muhammad, circa 1399 to 1337 BT (570 to 632 c.e.) as the last of a series of Prophets of God. It became the largest religion on Earth by the middle Information Age, and split into a number of space-based sects during the Interplanetary Period.
The post-expulsion Stella Umma was based on a combination of Orbital Islam and reformed Earth-based Islam. Many thousands of worlds are part of the Umma Core and the Umma Shell, and Umma Islamic communities can be found on millions of other worlds.
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Betelgeuse Umma - Text by M. Alan Kazlev A Consolidation Age offshoot of the Umma Shell that settled in the solward Betelgeuse volume, the Betelgeuse Ummaites drifted progressively away from the rest of the Shell, becoming unrecognisable as Umma (apart from a few cultural and religious quirks) by the middle Integration period. Currently they are one of several dozen primary cultures that make up the volume.