What is the hottest planet in our solar system？ A good guess might be Mercury， since it is the planet closest to the sun. But the correct answer is the next closest， Venus.

Known as the Earths twin， Venus is similar to our planet in many ways. Both are about the same size， both have cloudy air， and both share some of the same landscape features： mountains， plains， and high plateaus. But while the earth has an average temperature of 14℃， Venus averages 462℃. Whats more， the temperature on Venus remains the same all over the planet， and its as hot at night as it is during the day.

Why is Venus so hot？ The answer lies in its thick air， the densest in our solar system. Thick yellow clouds fill the planet. The clouds get the suns heat in Venuss air， so the planet is always hot. Many scientists believe that Venus once had oceans， just like the Earth， but they became air.

太陽系中最熱的行星是哪顆呢？一種猜測說是水星，原因是水星離太陽最近。但是正確的答案是離太陽第二近的行星——金星。

眾所周知，金星與地球好似一對雙胞胎，在很多方面都相似。兩顆行星的體積差不多大，都有云層，也有一些相同的地形特征：山、平原和高原。但是地球的平均溫度是14℃，而金星的平均溫度是462℃。更甚的是，金星的溫度到處都一樣，白天和晚上的溫度也沒有什么變化。

為什么金星的溫度這么高呢？答案在于其稠密的大氣，金星上的大氣是太陽系中最稠密的。星球上布滿了厚厚的黃色云層，大氣中的云層吸收太陽的熱量，所以金星上的溫度總是很高。許多科學(xué)家認為金星以前上有海洋，就像地球一樣，只是后來海洋變成了大氣。

Vocabulary

solar system 太陽系

plain n. 平原

high plateau 高原

average adj. 平均的 v.平均

dense adj. 稠密的;密集的（densest為其最高級形式）