CNN原文：

A recently discovered green comet will soon zip by Earth for the first time in 50,000 years. It was last visible in the night sky during the Stone Age. Discovered on March 2, 2022, by astronomers using the Zwicky Transient Facility’s wide-field survey camera at the Palomar Observatory in San Diego County, California, the comet made its closest approach to the sun on January 12, according to NASA. Named C/2022 E3 (ZTF), the comet has an orbit around the sun that passes through the outer reaches of the solar system, which is why it’s taken such a long route — and long time — to swing by Earth again, according to The Planetary Society.

最近刚发现的一颗绿色的彗星将很快掠过地球，它上次到访还是在5万年前，出现在石器时代的一次夜空中。据美国宇航局称，天文学家于2022年3月2日在加利福尼亚州圣地亚哥县帕洛马天文台使用兹威基瞬态设施的宽视场巡天相机发现了这颗彗星，该彗星于1月12日最接近太阳。据行星学会称，这颗彗星名为C/2022 E3 (ZTF)，它有一个绕太阳运行的轨道，穿过太阳系的外围，这就是为什么它需要这么长的路线以及很长的时间才能再次绕过地球。

1.comet n.彗星

2.the Stone Age 石器时代

3.NASA （National Aeronautics and Space Administration）美国航空航天局

4.have an orbit around the sun 有一个绕太阳运行的轨道

5.the solar system 太阳系

【拓展】

6.the Milky Way Galaxy 银河系

例句：The Milky Way is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.

银河系是包括太阳系在内的星系，之所以称之银河系，是因为该星系从地球夜空中看上去就是一个朦胧的光带，用肉眼无法单独区分形成该光带的恒星。

7.light year 光年

例句：The nearest star to earth is about 4 light years away.

地球离最近的恒星大约为4光年。