# BigBangRegistry\.com

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## Pages
- [Privacy Policy](http://bigbangregistry.test/privacy-policy/)
- [Contact Us](http://bigbangregistry.test/contact-us/)
- [Terms of Service](http://bigbangregistry.test/terms-of-service/)
- [Disclaimer](http://bigbangregistry.test/disclaimer/)
- [Project History](http://bigbangregistry.test/about-us/project-history/)

## Posts
- [What Is the Lepton Epoch? A Guide to the Early Universe’s Lepton\-Dominated Era](http://bigbangregistry.test/what-is-the-lepton-epoch/): The lepton epoch was a brief but pivotal period roughly 1–10 seconds after the Big Bang, when electrons, positrons, and neutrinos dominated the universe\. It set the stage for neutrino decoupling, the annihilation of electron\-positron pairs, and the primordial conditions that led to Big Bang nucleosynthesis\.
- [What Are Hot and Cold Spots in the CMB? A Guide to the Universe’s Baby Picture](http://bigbangregistry.test/what-are-hot-and-cold-spots-in-the-cmb/): Hot and cold spots in the cosmic microwave background are tiny temperature variations—about one part in 100,000—that reveal the seeds of galaxies and the physics of the early universe\. This guide explains their origin, how missions like COBE, WMAP, and Planck measured them, and why they matter for cosmology\.
- [What Happened Before, During and After the Big Bang?](http://bigbangregistry.test/what-happened-before-during-after-big-bang/): The Big Bang is the leading scientific explanation for the origin of the universe, describing how it expanded from an extremely hot, dense state about 13\.8 billion years ago\. This comprehensive guide walks through the sequence of cosmic epochs—from the Planck epoch to the present day—covering the formation of particles, atoms, stars, and galaxies, and the evidence that supports this model\.
- [Evidence for the Big Bang: How Do We Know It Happened?](http://bigbangregistry.test/evidence-for-the-big-bang/): Explore the compelling evidence for the Big Bang theory, from the expanding universe and cosmic microwave background to the formation of the first elements\. Learn how astronomers have pieced together the story of our cosmos\.
- [The Standard Model of Cosmology: ΛCDM Explained](http://bigbangregistry.test/lambda-cdm-standard-model-cosmology/): The Lambda\-Cold Dark Matter \(ΛCDM\) model is the standard model of Big Bang cosmology, describing the universe's origin, evolution, and composition\. This guide explains its key components, the cosmic epochs from the Planck epoch to structure formation, and the evidence supporting it\.

## Categories
- [Cosmic Timeline](http://bigbangregistry.test/category/cosmic-timeline/)
- [Early Universe](http://bigbangregistry.test/category/early-universe/)
- [Big Bang](http://bigbangregistry.test/category/big-bang/)
- [CMB](http://bigbangregistry.test/category/evidence-observations/cmb/)
- [Recombination](http://bigbangregistry.test/category/cosmic-timeline/recombination/)

## Tags
- [cosmic microwave background](http://bigbangregistry.test/tag/cosmic-microwave-background/)
- [recombination](http://bigbangregistry.test/tag/recombination/)
- [inflation](http://bigbangregistry.test/tag/inflation/)
- [cosmic epochs](http://bigbangregistry.test/tag/cosmic-epochs/)
- [Big Bang](http://bigbangregistry.test/tag/big-bang/)

## Optional
- [Sitemap index](http://bigbangregistry.test/sitemap_index.xml)