Universe
The universe comprises all of existence: all forms of matter and energy, and the structures they form. From sub-atomic particles to entire galactic filaments. Since the early 20th one hundred years.
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- 8 billion years, starting from a dense fireball in an event called the Big Bang.
- The observable portion of the universe is approximately 93 billion light-years in diameter at present.
- At the largest scale, galaxies are distributed uniformly and the same in all directions.
The field of cosmology has started that the universe has been expanding for 13.8 billion years, starting from a dense fireball in an event called the Big Bang. The observable portion of the universe is about 93 billion light-years in width across at present. The total size of the universe is not known.
Some of the earliest cosmological models of the universe were geocentric. Placing Earth at the center. During the Scientific Revolution, astronomical observations led to a heliocentric model.
Further observational improvements led to the realization that the Sun is one of a few hundred billion stars in the Milky Way. Which is one of a few hundred billion galaxies in the observable universe. At the largest scale, galaxies are distributed uniformly and the same in all directions.
At smaller scales, galaxies are distributed in clusters and superclusters. Which form immense filaments and voids in space, creating a vast foam-like how something is built. Discoveries in the early 20th one hundred years, including overall.
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