Name: 行星维持生命的要素
Uploaded: 2016-08-12T14:49:58Z
Duration: 13 min 32 s
Description: “金星太热，火星太冷，地球刚刚好”，行星科学家戴夫·布莱恩说。但为什么？在这个关于行星的幽默的演讲中，布莱恩解释了一个有生命行星背后的有趣科学，以及为什么人类可以在正确的时间、正确的地点，出现在有生命星球的时间线上。

“金星太热，火星太冷，地球刚刚好”，行星科学家戴夫·布莱恩说。但为什么？在这个关于行星的幽默的演讲中，布莱恩解释了一个有生命行星背后的有趣科学，以及为什么人类可以在正确的时间、正确的地点，出现在有生命星球的时间线上。

行星维持生命的要素

Our planet is the only known place in the universe where 8.7 million species thrive, thanks to a rare balance of energy, nourishment, and liquid water. Even within our solar system, only Venus, Earth, and Mars once had a shot at surface water, but Earth's stable conditions set it apart. Planetary atmospheres and magnetic fields play crucial roles in protecting or stripping away the ingredients for life. With billions of potentially habitable planets in our galaxy, understanding Earth's unique story could reveal which distant worlds might also sustain life.