Mercury


 * "Why do people even live on Mercury?"
 * Isaac Clark commenting on the living conditions'''

Mercury is a planet in the Sol System.

Geography and structure
Mercury is composed of a massive iron core, which increases the planet's density, a thin mantle and a crust. Mercury is far too close to its sun to hold a substantial atmosphere, so it is currently limited. Because of that, the world boils over in the day (approx 29.5 days) to approximately 700 K (over 420oC) and freezes solid at night to 80 K (-193oC).

Nevertheless, there is one human settlement, contained entirely inside a cave, with a population of only 5,000 each year. This gives Mercury a tiny Enviroscore of 100 and it is highly unlikely that it will get any lower. The Caloris Basin, a huge crater in Mercury's north polar region is caused by the impact of a massive asteroid early in the planet's history.