How was the universe formed?

All of space, time, matter, and energy were created during the Big Bang, a cosmic scale explosion that is known to have created the universe.

Based on Einstein's theory of relativity, which links matter and energy, the Big Bang theory starts with a very dense but small point of matter that has enormous amounts of energy. Since energy can change into matter, according to Einstein's theory, this dense mass had so much energy that it exploded, creating the universe's matter.

Since neither mass nor energy can be created, as the laws of conservation of mass and energy demonstrate, the Big Bang is more about the transformation of this nearly infinite amount of energy into matter than it is about the creation of the Universe.

The universe is believed to have formed approximately 13.8 billion years ago in an event commonly referred to as the Big Bang. This theory suggests that the universe began as an extremely hot and dense singularity, which then rapidly expanded and continues to expand to this day. As the universe expanded and cooled, particles began to form, eventually leading to the formation of atoms, stars, galaxies, and other celestial bodies through processes such as gravitational attraction and nuclear fusion.