 But every so often, it's not pigeon poo, it's something really profound, like the discovery of the light from the Big Bang. So that's why these anomalies are so interesting to study, because they every so often are this little gateway, this little doorway to a new way of looking at nature. One of the anomalies that puzzles astronomers today, which also ties back to the Big Bang theory, is the rate at which the universe is expanding.