In the very first seconds of the universe’s existence, particles of matter and antimatter were formed. And the result of the collision of these particles and antiparticles were protons and neutrons. These are elementary particles that make up the nuclei of atoms.
A few minutes after the universe appeared, its temperature dropped to 1.8 billion°F. This was enough for neutrons and protons to form hydrogen and helium nuclei.
After 380,000 years, the temperature of the universe cooled to 4,940°F. Thanks to this, protons and electrons could combine to form the first atoms, and the universe was filled with huge clouds of hydrogen and helium. Space became transparent, but darkness still reigned everywhere.
100-200 million years passed after the Big Bang before the first stars began to form, gradually forming galaxies.
9 billion years after the Big Bang, our solar system was formed from a molecular cloud of gas and dust, and about 100 million years later, the Earth was formed. A little less than 1 billion years later, life emerged on it.
13.7 billion years after the Big Bang, the first recognizable humans emerged on Earth. This happened quite recently, about 2 million years ago.

Comments to article «How Our World Formed, and What the Multiverse Is»