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The thin disk of our galaxy began to form at about 5 billion years (8.8 Gya), [12] and the Solar System formed at about 9.2 billion years (4.6 Gya), with the earliest traces of life on Earth emerging by about 10.3 billion years (3.5 Gya). The thinning of matter over time reduces the ability of gravity to decelerate the expansion of the universe ...
Origins. In the first moments after the Big Bang, the universe was extremely hot and dense. As the universe cooled, conditions became just right to give rise to the building blocks of matter – the quarks and electrons of which we are all made. A few millionths of a second later, quarks aggregated to produce protons and neutrons.
Jan 11, 2021 · Alternatively, a deuteron and a proton can pair up to create a “light” version of helium called helium-3, which has two protons and one neutron. With the addition of another neutron, you get ...
1.2 Atomic nuclei and binding energy, with some predictions on isotope abundances 10 1.3 Summary 17 2 Introduction to the Universe: the baryonic matter 19 3 Element and isotope abundances: reference collection 24 3.1 Hydrogen and helium and their special significance 24 3.2 Metal-poor stars: the most ancient matter of the Galaxy 25 3.3 ...
Oct 1, 1994 · The Evolution of the Universe. Some 15 billion years ago the universe emerged from a hot, dense sea of matter and energy. As the cosmos expanded and cooled, it spawned galaxies, stars, planets and ...
Feb 2, 2022 · Step 4: Let there be light. About 380,000 years after the Big Bang, matter cooled enough for electrons to combine with nuclei to form neutral atoms. This phase is known as "recombination," and the ...
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The first long-lived matter particles of any kind were protons and neutrons, which together make up the atomic nucleus. These came into existence around one ten-thousandth of a second after the ...
