How is the universe formed? Geography …
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Meghna Thapar 5 years, 7 months ago
Our universe began with an explosion of space itself - the Big Bang. Starting from extremely high density and temperature, space expanded, the universe cooled, and the simplest elements formed. Gravity gradually drew matter together to form the first stars and the first galaxies. Protons and neutrons started to form within the first second; within minutes these protons and neutrons could fuse and form hydrogen and helium nuclei. After 300,000 years, nuclei could finally capture electrons to form atoms, filling the Universe with clouds of hydrogen and helium gas. The Universe begins 13.7 billion years ago with an event known as the Big Bang. Both time and space are created in this event. Nuclei of hydrogen, helium, lithium and other light elements form.
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