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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following best describes Big Bang Nucleosynthesis?
A
the unending expansion of the universe
B
the birth of elementary particles in the beginning of time
C
a hot plasma in which energy is distributed evenly all throughout
D
the formation of atomic nuclei through the combination of sub-atomic particles during the Big Bang
Explanation: 

Detailed explanation-1: -a. Through the combination of hadrons during the Big Bang.

Detailed explanation-2: -In physical cosmology, Big Bang nucleosynthesis (abbreviated BBN, also known as primordial nucleosynthesis) is the production of nuclei other than those of the lightest isotope of hydrogen (hydrogen-1, 1H, having a single proton as a nucleus) during the early phases of the Universe.

Detailed explanation-3: -Light elements (namely deuterium, helium, and lithium) were produced in the first few minutes of the Big Bang, while elements heavier than helium are thought to have their origins in the interiors of stars which formed much later in the history of the Universe.

Detailed explanation-4: -Nucleosynthesis is the process that creates new atomic nuclei from pre-existing nucleons (protons and neutrons) and nuclei. According to current theories, the first nuclei were formed a few minutes after the Big Bang, through nuclear reactions in a process called Big Bang nucleosynthesis.

Detailed explanation-5: -Nucleosynthesis in the Early Universe The term nucleosynthesis refers to the formation of heavier elements, atomic nuclei with many protons and neutrons, from the fusion of lighter elements. The Big Bang theory predicts that the early universe was a very hot place.

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