translation.en: The asteroids are a substantial amount of real estate, but not very large. And it's not very promising for life, since most of it consists of rock and metal, mostly rock.
translation.zh: 这些小行星占据了相当一部分的宇宙空间 尽管总量不算很大 并且那里不适宜生命的发展 因为那里大多数是石头和金属，大多数是石头