火星的生命英语作文

火星的生命英语作文范文

The current understanding of planetary habitability—the ability of a world to develop and sustain life—favors planets that have liquid water on their surface. This most often requires that the orbit of a planet lie within the habitable zone, which for the Sun currently extends from just beyond Venus to about the semi-major axis of Mars.During perihelion Mars dips inside this region, but the planet’s thin (low-pressure) atmosphere prevents liquid water from existing over large regions for extended periods. The past flow of liquid water, however, demonstrates the planet’s potential for habitability. Recent evidence has suggested that any water on the Martian surface would have been too salty and acidic to support terrestrial life.pounds would quickly break down in the Martian atmosphere.It is possible that these compounds may instead be replenished by volcanic or geological means such as serpentinization.

【火星的生命英语作文范文】