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About 377,000 years after the Big Bang, the density of matter and photons in our Universe dropped to the point where photons were no longer likely to blast electrons away from nuclei. At this point, photons could travel freely throughout our Universe, which meant our Universe had become "transparent" to light (it had previously become transparent to neutrinos). The photons that became free to roam eventually reached our Earth, and are now seen as the CMBR.

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When astronomers say that the universe became transparent years after the big bang what do they mean?

In the early period after the Big Bang, the universe consisted of a plasma of nuclei, electrons and photons. These protons were bound in the plasma and not free to move about. About 0.4 million years after the Big Bang, when the universe had cooled to around 4000 K, photons stopped being in thermal equilibrium with matter: the universe became transparent to photons - light could move about.


How long was it before the universe became transparent?

The universe became transparent approximately 380,000 years after the Big Bang, during a period known as recombination. At this point, the temperature of the universe cooled enough for protons and electrons to combine and form neutral hydrogen atoms, allowing photons to travel freely. This event marked the release of the cosmic microwave background radiation, which provides a snapshot of the universe at that time. Prior to recombination, the universe was opaque due to the dense plasma of charged particles.


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The transparent eyeball is a metaphor used by American writer Ralph Waldo Emerson to describe a state of heightened awareness where an individual is completely absorbed in the world around them, feeling a sense of unity with nature and experiencing a connection to the divine. It represents a moment of clarity and insight where one feels transparent and open to the truths of the universe.


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