关于一种星球的介绍英文作文，运用列数字的方法写地球

有关一种星球的讲解英文作文？

Four stars near the bright band of the Milky Way have revealed a secret:

　　the presence of a hidden dwarf galaxy.

　　Six years ago astronomers predicted that such a galaxy might be in that region based on observed ripples in the Milky Ways disk.

　　The galaxy is small, faint, and dominated by invisible dark matter.

　　That combination obviously makes it very hard to see.

　　Furthermore, it lies behind a shroud of dust that blocks any visible light from passing through.

　　Now scientists have identified four stars that appear to belong to the galaxy by examining infrared light, which can cut through dust.

　　The stars are known as Cepheid variables.

　　They pulse brighter and dimmer in a predictable pattern, which allows astronomers to determine how far they are from us—about 300,000 light years.

　　That distance puts them well beyond the main body of the Milky Way and right where an orbiting dwarf galaxy might lie.

　　The finding is in the Astrophysical Journal Letters.

　　Dwarf galaxies like this one are thought to contain more dark matter than regular matter.

　　So tracking down such dwarfs could give researchers more clues in the quest to figure out what dark matter is made of.

用列数字和举例子的方式描写地球？

地球是人类唯一的家园。在茫茫宇宙当中， 这个蔚蓝的星球是那样的美丽。

地球是一个接近于圆的球体。“坐地日行8万里”，从这句诗里边，我们完全就能够清楚地球的一周的长度。科学家告诉我们，地球是一个平均半径6371公里的巨大星球。地球的赤道周长大概是4万公里。地球总面积大概是5.1亿立方公里。地球质量大概是6×10^21吨（这个数字是60万亿亿吨）。

假设和茫茫的宇宙相比，地球就显得很小。太阳直径基本上等同于地球直径的109倍，体积大概是地球的130万倍。假设说太阳是个大篮球，那地球就像一粒沙子。

给找寻星球的作文取什么标题？

找寻星球的作文取什么标题

未来火星

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