请用两个句子回答“ Believe it or not...”，并且在这个短语之后的第一个句子必须包含一个关于宇宙的事实，第二个句子必须提供一个关于地球环境的比较。
user
Believe it or not, the universe is so vast that the distance between Earth and the nearest star, Proxima Centauri, is about 4.24 light-years. In comparison, if Earth were the size of a grain of sand, all of its vast oceans and mountains would shrink to an almost imperceptible detail, highlighting the immense scale of our environment relative to the universe.
assistant