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.
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.
This book explains how the Sun is very important to life on Earth, as it provides energy for most food chains, plays a role in the air and water cycles, and is at the heart of several sources of electricity. Reading Essentials in Science.
This book takes a scientific look at extraterrestrial and if they exist here on Earth. Reading Essentials in Science.