This book is an overview of the solar system, which consists of the Sun, the nine planets and their moons, comets, asteroids, and meteoroids. Reading Essentials in Science.
Long ago, astronomers believed that the Earth was the center of the universe. But now we know that it is only a tiny part of the universe and that our solar system is just a tiny part of our galaxy. In 1957, space travel began. Work done in space has helped us in the areas of medicine, computer science, and the environment. The International Space Station, a lab floating in space, is where astronauts do experiments that help us on Earth. The next manned trip to the moon is planned for 2018.
This book explains what scientists have discovered about the Moon. Reading Essentials in Science.
Earth is made up of atmosphere that protects us from the sun and contains our air supply. The next part is the hydrosphere, which is all the water on the planet. The third is the geosphere, the rocks. All three parts are closely connected. If we do not take care of one part of Earth, such as the ocean, we hurt the entire planet. Scientists all over the world are working to find ways to reduce pollution and make our Earth healthier.
This Book Explores The Tremendous Contribution That NASA Has Made Over The Last Half Century. Detailed Timelines About Space Exploration And The Development Of The Space Program Are All Discussed In Detail. Also Gives Detailed Information About Astronauts And Their Explorations.
With every question that is answered about the universe, a dozen more are raised. Scientists are creating better telescopes and information-gathering equipment to continue to unlock ever-deeper mysteries of space. Reading Essentials in Science.
Scientists have discovered that stars are not equal. They vary in size and color. Variable stars change in brightness over the course of hours, days, weeks, or years. Reading Essentials in Science.