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This comet has not been seen by earthling since the Stone Age,
自石器时代以来，地球人就没有在看见过这颗彗星，
Woolly mammoths were still lumbering across the landscape when it last swung through the inner Solar System.
当它最后一次穿过太阳系内部时，长毛猛犸象还在这片土地上笨拙地行走。
"The best estimate we can come up with is about 50,000 years."
“我们最保守的估计是已经大约5万年了。”
Scott MacNeill is an astronomer at the Ladd and Frosty Drew Observatories,
斯科特·麦克尼尔是Ladd天文台、Frosty Drew天文台的天文学家，
he said astronomers determine its long period orbit by making careful observations of the path of the comet.
他表示，天文学家会通过仔细观察彗星的运行轨迹来确定它的长周期轨道。
Discovered near the orbit of Jupiter last March, the green comet is closest to Earth this week.
这颗绿色彗星是去年3月在木星轨道附近被发现的，本周，它距离地球最近。
The green color, from the break down of carbon molecules within the comet.
其颜色为绿色，是因为该彗星内部碳分子分解的原因。
The comet is difficult to see, it's in the North Sky above the North Star this week.
不过这颗彗星很难被看到，本周它会出现在北极星上方的北方天空。
It'll appear as a white smudge, best seen with binoculars and telescopes.
其外表看起来像一个白色的污点，最好用双筒望远镜和望远镜来进行观测。
Tough to see, but worth the effort.
虽然很难看到，但值得一试。
"This may be the last time that it actually visits the inner Solar System because it may get ejected from this pass."
“这可能是它最后一次造访太阳系内部了，因为它可能会在此次飞行期间被驱逐出去。”
