The Big Bang Theory

The Big Bang

Origin of the Theory

The big bang was an explosion that started space and time and birthed the universe. We don't know how or what happened before and only know what happened after. The big bang theory (not the show) originated from the mind of Belgian cosmologist Georges Lemaitre after noticing that the universe was expanding. He figured that if the universe was expanding (because Hubble was using a telescope and noticed that the universe was expanding), the universe had to start at an infinitely small point. George Gamow and his colleagues further developed the theory during the 1950s. Gamow and many other physicists used Hubble's law to prove it. Hubble's law is v = H0D (recessing velocity = Hubble constant × distance) which means the universe is expanding. Many people disagreed with this, like Fred Hoyle, creator of the steady-state theory, which says that matter will continue being created as the universe expands. It's similar to the big bang theory but has one major flaw. Matter cannot be created or destroyed.

After the Blast

The point where the universe started was smaller than an atom, unimaginably hot, and the only moment where all matter was created. A fraction of a second later, no matter could be created or destroyed, the universe became the size of a city, and energy became particles. 380,000 years later, the universe cooled down enough to create the first atoms, hydrogen and helium. Light could travel through space more efficiently, so the universe became transparent. About 550 million years in, stars started forming, and the first galaxies formed 50 million years after they were formed. The first galaxies were small and irregular, but they became more spiral-like and larger as time passed. 9.3 billion years after the Big Bang, our solar system formed. The universe keeps expanding, and everything is getting spread apart. This expansion could cause the death of the universe.

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The Kardashev Scale of Civilization

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Hubble's Law

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The Solar System

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