A comet is an icy, small Solar System body that, when passing close to the Sun and begins to release gases, a process called outgassing.
上一篇:罗塞塔的目标彗星是一个惊喜的双太空岩石.
Rosetta's target comet is a surprise double space rock.
她第一次发现彗星是在1786年8月1日。
Herschel's first comet discovery came on the night of 1st August, 1786.
麦克诺特彗星是估计10万亿个肮脏的雪球之一,都绕着太阳转。
Comet McNaught is one of an estimated ten trillion dirty snowballs, all circling the Sun.
在欧洲文艺复兴前,人们认为彗星是地球大气中的一种扰动。
Up until the Renaissance, it was commonly believed that comets were mere disturbances in Earth's atmosphere.
这些图像显示彗星是太阳系中最具地质活性的东西,”Pajola说。
These images are showing that comets are some of the most geologically active things in the solar system," Pajola said.
P/Churymov-Gerasimenko彗星是45亿年前太阳系形成过程中保存材料的冰雪粉尘。
Comet 67P/Churymov-Gerasimenko is a dirty snowball of ice and dust that preserves material from the formation of the Solar System 4.5 billion years ago.
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