History of the universe, illustration
History of the universe, illustration. Timeline of the history of the Universe, from the release of the Cosmic Microwave Background, the oldest light in the cosmos (left) to the formation of the first stars and galaxies (centre and right). As the universe cooled after the big bang atomic nuclei began to form. After about 377, 000 years these nuclei combined with electrons to form atoms (mainly hydrogen), releasing photons which can still be detected today as the cosmic microwave background. Within a million years dense regions of atoms attracted nearby matter, forming gas clouds and, after 400 to 700 million years, stars and small galaxies
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Astronomic Astronomical Astrophysical Astrophysics Atom Bang Cosmic Cosmological Cosmology Cosmos Develop Developed Developing Expanding Exploding Forming Galactic Galaxies Horology Keeper Keeping Measure Measurement Microwave Nuclei Origin Photon Plasma Sequence Telling Time-keeper Time-keeping Time-telling Timekeeping Timeline
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