What is the Universe?

The universe is everything that exists. It includes all matter and energy, including planets, stars, galaxies, and all other forms of matter and radiation. It is thought to have begun with the Big Bang, a massive explosion that occurred approximately 13.8 billion years ago. Since then, the universe has been expanding and cooling, leading to the formation of galaxies and other structures.

The universe is composed primarily of dark matter and dark energy, with only a small percentage of its total mass-energy density made up of “normal” matter, like atoms.

Current scientific understanding of the universe is described by the Big Bang theory and the theory of general relativity. The current most accepted model is the Lambda-CDM model which describe the universe is composed of 73% dark energy, 23% cold dark matter and 4% of ordinary matter. Studies of the cosmic microwave background radiation, large scale structure of the universe, and the observed abundances of light elements are all consistent with this model.

Our understanding of the universe is still evolving, as new discoveries and technologies allow us to learn more about the universe and its origins.

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