Astronomers suspect that our Hubble volume has at least 1020 habitable planets; some might well look like Earth.
Astronomers suspect that our Hubble volume has at least 1020 habitable planets; some might well look like Earth.
天文学家猜测，在我们的哈伯体积之中，至少有1020颗适合居住的行星；其中有些看起来可能根本和地球没有两样。