In general, the photino birds are probably unaware of almost all other forms of life since dark matter interacts extremely weakly with baryonic matter (normal matter that is composed of atoms). The Photino Birds is a species of dark matter entity that prefers habitat in the gravity well of stars. In the novel Exultant it is hinted that over their exceedingly long history, the Xeelee have combined themselves with their technology and, as such, may not have a distinct individual presence that Humans would be familiar with. There is no explicit physical description of the Xeelee throughout the series. Over the billions of years since their migration, the Xeelee have become a ubiquitous part of the complex ecology of the supermassive black holes along with an unnamed number of other species that are also veterans of the same very early eras of the universe. Although the galactic black holes were trillions of times more massive than their ancestral homes, the Xeelee proved to be quite adept at using the complex physics around the event horizon for their purposes. As the primordial black holes evaporated over time the Xeelee eventually migrated to using the super-massive black holes around which Galaxies were forming. More so, heavier atoms were exceedingly rare because stars had not yet had the time to create them through nuclear fusion. The Xeelee use primordial black holes as a habitat, construction tool, and computing devices because, at the time they emerged, the event horizon was one of the few things that survived from earlier epochs that they understood. This potentially dates the Xeelee to when the universe was only a few hundred thousand years old, but with direct knowledge and observations that reaches back to within minutes of the big bang. The proto-Xeelee established symbiotic relationships with other survivors as well as autocatalytic reactions in the new baryonic matter, thus emerging what would later be called the Xeelee. The novel Exultant describes the progenitor of the Xeelee, referred to as the proto-Xeelee, as one of the few survivors of the last phase change (when the universe had cooled enough for atoms to form). Thus, life emerged when the universe was extremely young, to within Planck epoch of the Big Bang (10⁻⁴³ seconds after the Big Bang) there were intelligent civilizations that witnessed, and indeed consciously influenced, major events in the early universe such as inflationary expansion, symmetry breaking, and various phase changes.Īt the close of each of these epochs, as the universe took on a fundamentally different character and there was a corresponding mass extinction, but small enclaves of intelligence would survive in one manner or another, witnessing the universe becoming progressively colder and slower-reacting. This is not limited to particle matter, but also applies to more exotic structures such as dark matter, quarks, and flaws in space-time itself. The universe has a fundamental tendency toward complexity and autocatalytic systems are easily created. In the Xeelee Sequence, life and intelligence are ubiquitous throughout the universe. This has a profound influence on the various galactic economies and technological development of junior species. Most junior species see no benefit in developing technology on their own when they can simply steal it from the Xeelee debris. The Xeelee frequently leave behind derelict ships, tools, and other materials giving the appearance of thoughtlessness or reckless abandon at what a junior species might do with it. Their abilities in the series far exceed that of a Type III Civilization on the Kardashev scale.Īlthough the Xeelee seldom directly appear or take action in the stories, their impact on the development of most civilizations and the universe as a whole is profound. They have demonstrated the ability to routinely construct Closed Timelike Curves and have explored time travel to engineering their evolution and history as far back as 13.5 billion years ago (within two hundred million years of the Big Bang). Within the Xeelee Sequence, they are considered to be the most advanced of all Baryonic life-forms and possess technology and abilities far beyond other space-faring civilizations. They were first remotely mentioned in the 1986 short story "The Xeelee Flower", and were later central actors of several novels and a substantial number of short stories. The Xeelee are a hyper-advanced species from Stephen Baxter's Xeelee Sequence. Nightfighters as depicted on the cover of a Xeelee Sequence novel
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