Asteroids are incredible sources of information about the history of our solar system. Planetary geologist and National Geographic Explorer Bethany Ehlmann studies 图片 of Ceres, the largest asteroid in the 带, 皮带 between Mars and Jupiter.
Earth is the only planet known to maintain life. Find out the origins of our 首页 planet and some of the key ingredients that help make this blue speck in 太空 a unique global ecosystem.
