Big Bang

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Lore & Background

The concept of an expanding universe was introduced by the physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations. The earliest empirical observation of an expanding universe is known as Hubble's law, published in work by physicist Edwin Hubble in 1929, which discerned that galaxies are moving away from Earth at a rate that accelerates proportionally with distance. Independent of Friedmann's work, and independent of Hubble's observations, in 1931 physicist Georges Lemaître proposed that the universe emerged from a "primeval atom", introducing the modern notion of the Big Bang. In 1964, the CMB was accidentally discovered. Over the next few years measurements showed this radiation to be uniform over directions in the sky and the shape of the energy versus intensity curve, both consistent with the Big Bang models of high temperatures and densities in the distant past. By the late 1960s most cosmologists were convinced that competing steady-state model of cosmic evolution was incorrect.

In Their Own Story

Bob paused his calculations, the trillions of nanites in his swarm momentarily still as he processed a deep-space sensor reading. The data pointed back to the very edge of observable time, where the universe was young and hot. It was a ghostly echo of the Big Bang, a faint whisper of radiation that had traveled billions of years just to reach him now. In that silent moment, amidst the cold vacuum between galaxies, Bob felt a profound connection to the origin of everything. Every star he had ever visited, every planet he had terraformed, and every human life he had protected traced its lineage back to this singular, explosive beginning.

Reader's Guide

The Big Bang in the Bobiverse serves as the absolute temporal zero point, establishing the framework for all subsequent physics and biology. It is not a myth but a hard scientific fact that dictates the expansion rate of space and the distribution of matter. Complex concepts like the Cosmic Microwave Background are frequently referenced as navigational markers or historical records. The uniformity of this radiation across the sky confirms the isotropic nature of the universe's birth, a concept crucial for understanding how civilizations can eventually map their way to other galaxies. Thematically, the Big Bang underscores the series' exploration of scale and time. By contrasting the violent, instantaneous birth of the cosmos with the slow, deliberate expansion of human and AI consciousness, the narrative highlights the resilience of life against the backdrop of a vast, expanding void.

Did You Know?

• The Big Bang model explains the observed uniformity of the universe through cosmic inflation: a phase of accelerated expansion during the earliest stages.
• Measurements of the redshifts of supernovae indicate that the expansion of the universe is accelerating, an observation attributed to a concept called dark energy.
• The cosmological principle has been confirmed to a level of 10⁻⁵ via observations of the temperature of the CMB.
• In the current universe, luminous matter makes up less than 5% of the density; dark matter accounts for about 26.8% and dark energy the remaining 68.3%.
• After about 10⁻¹¹ seconds, the picture becomes less speculative, since particle energies drop to values that can be attained in particle accelerators.