Question

Which statement best describes the Big Bang Theory? ( not the TV show)

Galaxies within the universe collided about 13.8 billion years ago forming the present objects in the universe.
Galaxies within the universe collided about 13.8 billion years ago forming the present objects in the universe.
Existing objects in the universe move randomly with the potential of colliding in about 13.8 billion years.
Existing objects in the universe move randomly with the potential of colliding in about 13.8 billion years.
Galaxies throughout the universe moved toward each other after an event that occurred about 13.8 billion years ago.
Galaxies throughout the universe moved toward each other after an event that occurred about 13.8 billion years ago.
Most objects in the universe are moving away from each other as a result of an event that occurred about 13.8 billion years ago.

Answer 1

The best description of the Big Bang Theory is that it was an event about 13.8 billion years ago where space itself rapidly expanded, leading to the current outward movement of celestial objects in the universe.

Step-by-step explanation:

The Big Bang Theory best describes the beginning of the universe as an event that occurred approximately 13.8 billion years ago, not as a collision of galaxies but as a rapid expansion of space itself. This expansion has resulted in most objects in the universe moving away from each other. Evidence supporting this theory includes the observation that galaxies are receding from one another, the cosmic microwave background radiation, and the isotropic nature of the universe. Initially, the universe was hot and dense, and it took a few hundred million years after the Big Bang before galaxies began to form.