Cosmic Background Radiation

Real World Example

Imagine waking up to the smell of a delicious dinner you cooked the night before. Just as the aroma lingers in your home long after the meal is finished, cosmic background radiation is like the scent that remains from the "cooking" of the universe during the Big Bang. The connection here is that both the smell and the radiation are remnants of an earlier event, with the aroma being the leftover evidence of your culinary creation, while the cosmic background radiation is the electromagnetic "scent" that fills the universe, indicating the Big Bang's occurrence billions of years ago.