Kasting J F, Toon O B, Pollack J B
Sci Am. 1988 Feb;256(2):90-7. doi: 10.1038/scientificamerican0288-90.
Planets with temperate, earthlike climates were once thought to be rare in our galaxy. Mathematical models now suggest that if planets do exist outside the solar system, many of them might be habitable.
拥有温和、类似地球气候的行星曾被认为在我们星系中很罕见。现在数学模型表明，如果太阳系外确实存在行星，那么其中许多可能适合居住。
