Many scientists believe it would be possible to maintain a permanent human presence on Mars or the Moon. On the other hand, conditions on Venus are so extreme and inhospitable that maintaining a human presence there would be impossible.
First, atmospheric pressure at Venus’ surface is at least 90 times greater than the pressure at Earth’s surface. This means that a force of 100 kilograms is pressing down on every square centimeter of surface. All spacecraft that have landed on Venus have been crushed by this extreme pressure within an hour of landing. Almost anything humans might land on Venus would be crushed as well.
Second, as far as we know, there are no reservoirs of water on Venus’ surface, and the planet’s atmosphere, made up mostly of carbon dioxide, nitrogen, and sulfuric acid, contains hardly any oxygen or water vapor. Water and oxygen would therefore probably have to be supplied to Venus from Earth. The idea of ensuring a regular supply of water and oxygen from Earth is impractical in the extreme and would probably defeat the purpose of establishing a permanent station on Venus.
Third, very little sunlight reaches the planet’s surface. About 60 percent of the sunlight that hits Venus is reflected back into space by the thick clouds that fill the atmosphere, which means that only 40 percent of the sunlight can get through the clouds. Below these clouds is a dense layer of carbon dioxide, which blocks even more light, so very little light reaches the surface. The lack of light would prevent the use of solar power cells, so humans could not get electricity to power their machines and equipment.
- It would be possible/impossible to do … 做。。。是可能 / 不可能的
- permanent adj. 永恒的
- on the other hand 另一方面； On one hand 一方面
- Venus n. 金星
- inhospitable adj. 荒凉的；不适居留的；不好客的
- at least 至少
- press down 压
- square adj. 平方的；正方形的； n. 平方；广场；正方形
- crush v. 压碎；变形
- as well = too 也
- as far as we know 据我们所知
- reservoir n. 水库；蓄水池
- carbon dioxide 二氧化碳
- nitrogen n. 氮
- sulfuric adj. 硫磺的
- hardly adv. 几乎不；刚刚
- be supplied to 提供给
- the purpose of doing… 做。。。的目的
- get through 通过；到达；接通电话；熬过（困难时期）
- dense adj. 浓厚的
- solar power cell 太阳能电池