The Knowledge of the Night
Our galaxy is called the Milky Way. It is shaped in a spiral, like a spinning octopus. The spiral arms and center of our galaxy are bright because there are many stars close together. Our galaxy is different from many other galaxies. Older, smaller, elliptical, and irregular galaxies do not contain the right amounts of elements necessary to form the proper balance of stars and planets needed to support life.
Some stars explode into supernovas. Deadly radiation flows through nearby stars and planets. The center and arms of galaxies are flooded with high amounts of radiation. Most stars are located in places with too much harmful energy for life.
Our solar system is located in the outer regions of the Milky Way. Most of the stars in our galaxy are in the larger spiral arms or in the center. There are few stars near us. Because of this, there is a low amount of radiation surrounding our solar system, and we can observe the rest of the universe and our own galaxy much better.
There is much more evidence from the universe in The Physical Sciences.