GENERAL KNOWLEDGE

Detailed explanation-1: -The Universe is uneven, and so are the stars and galaxies and clumps of matter that form within it. The Universe became transparent to the light left over from the Big Bang when it was roughly 380, 000 years old, and remained transparent to long-wavelength light thereafter.

Detailed explanation-2: -Until roughly 380, 000 years after the Big Bang, the entire universe was a thick opaque cloud of plasma of electrons and nuclei. As the universe expanded, it cooled off enough to let the plasma become atoms, and the cosmos became transparent. We observe the light from this time as the cosmic microwave background (CMB).

Detailed explanation-3: -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 first time that photons could rest for a second, attached as electrons to atoms. It was at this point that the universe went from being totally opaque, to transparent.

Detailed explanation-4: -About 300, 000 years after the big bang, the universe was like a smoke-filled chamber from which light could not escape. By the time the universe was a billion years old, the smoke-actually a gas of light-trapping hydrogen-had cleared almost entirely, allowing stars and galaxies to become visible.