? That along with this, the Earth also keeps rotating on its axis at a speed of 1,669.8 kilometers per hour and this is what creates day and night? ? That the Sun is also a star and there are more than 200 billion stars like it and more than 10 trillion planets in our galaxy? ? That the galaxy of which our solar system is a member is itself a member of a local group of galaxies and that local group is also a member of a group larger than itself, and this sequence continues like this? This book provides such amazing information."