translation.en: The colors reflect the composition of these asteroids, dry and stony in the center, water-rich and primitive towards the edge, water-rich asteroids which may have seeded the oceans and the seas that we find on our planet when they bombarded the Earth at an earlier time.
translation.zh: 颜色可以反映这些小行星的成分。 中间的干燥多岩石， 边缘的富含水分，成分原始， 这些富含水分的小行星， 可能正是它们早期撞击地球时 为地球带来了海洋的种子。