The Big Bang is the scientific theory that the universe began as a single, extremely hot and dense point about 13.8 billion years ago and has been expanding ever since. All matter, energy, and space itself originated from this event.

Tap to flip back

Earth is approximately 4.54 billion years old. Scientists determined this age by studying radioactive elements in rocks and meteorites.

Tap to flip back

The universe is approximately 13.8 billion years old. Scientists determined this by measuring the leftover radiation from the Big Bang and observing how fast galaxies are moving away from each other.

Tap to flip back