How Special Our Earth Is In The Universe

Sun is one of the 15 billion stars in the Galaxy and our Galaxy is one of the 10 billion galaxies in the universe. If each star has about 10 planets on average, Earth will be just one of the 15 billions times 10 billions planets. Even if there exist enormous number of planets in the universe, Earth is very unique in the sense that it is extremely fine-tuned for all living creatures on Earth. The following 10 facts about the Earth will be described: