EVERYDAY SCIENCE

Detailed explanation-1: -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.

Detailed explanation-2: -Electrons began to combine with hydrogen and helium nuclei. High energy photons from this period rushed outwards. The early universe was so hot, that as it has expanded and cooled, the highly energetic photons from that time have had their wavelengths stretched tremendously.

Detailed explanation-3: -It’s too hot not only to form atoms and bound atomic nuclei, but even individual protons and neutrons are impossible; the Universe is a hot, dense plasma filled with all the particles and antiparticles that can exist.

Detailed explanation-4: -The evidence is overwhelming that the universe was very hot and very dense 10–20 billion years ago, and has been expanding and cooling every since.”

Detailed explanation-5: -The First Moments of History Approximately one second after the big bang, the universe was about 400, 000 times as dense as water, and the temperature was 10 billion kelvins.