What smells like rotten eggs, a used litter box, and an almond-munching mortician? The answer is one of those dirty snowballs in space, a comet. Comet Churyumov-Gerasimenko, to be exact, which is starting to thaw as it closes in on the Sun.
Since August, the European Space Agency's Rosetta spacecraft has been monitoring the comet. Right now, Churyumov-Gerasimenko is between the orbits of Mars and Jupiter, some 300 million miles from Earth. It's so chilly out there that scientists expected Rosetta's instruments to detect scarcely more than odorless carbon dioxide from the comet.
自八月起，欧洲航天局的罗斯塔飞船便一直在监测该彗星。如今，丘留莫夫-格拉西缅科彗星已进入了火星和木星之间的轨道，离地球约3亿英里 。那里非常寒冷，因此科学家预测罗斯塔能够从该彗星上探测出几乎无味的二氧化碳 。
But instead Rosetta has also detected hydrogen sulphide—with its rotten egg odor—as well as ammonia, with a smell familiar to anyone who has changed a cat pan. Also in the mix: formaldehyde and methanol, found in embalming fluid, mixed with faint traces of poisonous hydrogen cyanide, which has an almond-like aroma.
Rosetta will deploy a probe to land on the comet this November, and will soon gather more pungent whiffs of the comet's appalling perfume. But by studying this Eau de Comet, researchers hope to better understand the deep—and apparently smelly—chemical origins of our solar system.
1.rotten eggs 臭鸡蛋
Those rotten eggs have stunk the place.
2.hydrogen sulphide 硫化氢
Low doses of hydrogen sulphide, a gas which smells like rotten egg, can safely reduce the metabolism of mice, putting them into a state of suspended animation.
3.hydrogen cyanide 联合国政府间气候变化专门委员会
So let's hydrogen cyanide as our first example.
Saturn is the second biggest planet in the solar system.