Introduction
The Big Bang theory is the leading explanation about how the universe began. It suggests that the universe was once extremely hot and dense and began expanding around 13.8 billion years ago.
The Beginning
According to the Big Bang model, the universe expanded from a very high-density and high-temperature state, and continues to expand today. This theory is supported by several key pieces of evidence.
Key Evidence
- Cosmic Microwave Background Radiation: A relic radiation filling the universe, which is a remnant from an early stage of the universe.
- Redshift of Galaxies: Observations of galaxies show that distant galaxies are moving away from us, implying that the universe is expanding.
- Abundance of Light Elements: The theory predicts the amounts of hydrogen, helium, and other elements produced in the early universe, which observations confirm.
Fascinating Facts
Did you know the universe might be infinite? If so, its expansion would not add more space but rather stretch the existing space continuously. 🤯