https://www.khanacademy.org/science/grade-7-science-tx/xe25057200abc6bd6:earth-and-the-solar-system 2026-07-03T03:00:41.306580382Z Earth and the solar system Explore the structure of our solar system from the Sun to the distant Oort cloud. Learn the order of the eight major planets, and examine features such as dwarf planets, comets, asteroids, and meteors. Then discover how the force of gravity keeps everything together. Finally, learn why Earth is the perfect planet for life as we know it. unit