A period of primordial nucleosynthesis created all of the hydrogen of the universe, and most of the helium observed today As the universe expanded and cooled, atoms were formed, and the background radiation decoupled from matter The very early universe went through a period of inflation, where the universe rapidly expanded It is the earliest epoch we identify after the Big Bang. Now, I asked the same question in the previous forum. There were no stars, and there were no galaxies. The earliest stages of the universe's existence are estimated as taking place 13.8 billion years ago, with an uncertainty of around 21 million years at the 68% confidence level. The Planck era is defined as the time when the universe was the size of the Planck length, $10^{-33}$ cms, and less, and the universe's age was $10^{-43}$ sec, the Planck time, and less. As the Universe expands, the relative importance of radiation, matter, dark energy, or neutrinos – they are all changing. This epoch will take place more than 100 trillion years from now. The chronology of the universe describes the history and future of the universe according to Big Bang cosmology. This era ended nearly 14 billion years ago. This incredible (and incredibly long) infographic from 2015 just keeps going and going and going. But when the universe hot 380,000 years in age, it marked the first time in the history of the universe that light could escape. The Era of Recombination Until around a few hundred million years or so after the Big Bang, the universe was a very dark place. The far future, after star formation ends in galaxies and after the last dwarf stars run out of fuel and go dark. Recombination Era. The universe has cooled to about 1,000C - cool enough for electrons to pair up with nuclei to form the first atoms. This light is the cosmic microwave background radiation that we still view today. Recombination Era. Expanding universe In the 1920s, astronomer Edwin Hubble discovered the universe was not static .

By this era, with only very diffuse matter remaining, activity in the universe will have tailed off dramatically, with … The 5 eras of the universe. Page 1 of 2 - Beyond 10100-The dark era of the universe. When the universe was younger than about 300,000 years, the temperature was high enough that all of the hydrogen was ionized, that is the electrons were free and separate from the protons. - posted in Science & Technology of the Future: The very last sentence of the timeline says " The universe continues to expand forever... but is essentially dead." This was the moment of first light in the universe, between 240,000 and 300,000 years after the Big Bang, known as the Era of Recombination. The “dark energy dominated” era, which began roughly 4 billion years ago, and will continue for the rest of the lifetime of the universe.

Era of Nucleosynthesis Key points: Recombination and its significance; imprint of structures on the cosmic background; determining if the Universe is at the critical density; dark matter Nuclear reactions could occur until about 3 minutes after the Big Bang. When the universe was younger than about 300,000 years, the temperature was high enough that all of the hydrogen was ionized, that is the electrons were free and separate from the protons. The temperature of the Universe also changes as well, and the sky also suffers a lot of changes that can be seen by us with the naked eye. As it continued to cool, eventually hydrogen and helium atoms formed. The Universe is the ultimate laboratory, and we can now probe it as never before through several powerful and diverse windows – electromagnetic waves, high-energy particles, and gravitational waves. Dark Era: The Dark Era is defined as "n >n; 101". Each of these windows provides a different view. Later, with cooling from the expansion the roles of mass and radiation changed and the universe entered a mass-dominated era. On September 14th, 2015, a ripple in the fabric of space, created by the violent collision of two distant black holes over a billion years ago, washed across the Earth.

The Degenerate Era: When the universe stops making stars When the last stars die, the cosmos will turn into a drab place, with smoldering stellar remnants fading from sight like cooling embers. By the end of this so-called Recombination Era, the universe consists of … At 300,000 years old, no light could escape because it was so dense. Do you think universe will ever end? A universe with oligarchs: Era of reionization likely the work of the most massive, luminous galaxies by Harvard-Smithsonian Center for Astrophysics A Hubble image of the starburst galaxy M82. Which makes sense, because we're talking about the entire lifespan of the Universe, from the moment of the Big Bang to the 'heat death' of everything we know and love.. Because of the presence of the free electrons, photons were scattered around in all directions and could not travel far before changing their direction. By the end of this era, only extremely low-energy photons, electrons, positrons, and neutrinos will remain.

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