作者: Christopher DePree PhD

Although it’s been around for more than 5, 500 years, astronomers say that we’ve learned more than 90 percent of what we know about the universe in just the last 50 years. Of this body of knowledge, …

Major new discoveries in space are made almost weekly and there is so much for any new enthusiast to learn and explore. Beginning with the solar system, the Sun, all its planets, major moons, and …