行星地球面对面危险近在咫尺？_BEC初级作文

行星地球面对面危险近在咫尺？

And he warns that its existence proves how little scientists know about other asteroids which could cause harm to the planet.

他还表示，这颗小行星的存在同时也说明，科学家对其他能对地球造成危害的行星所知甚少。

"We need to permanently track this asteroid, because even a small mistake in calculations could have serious consequences," he said.

他表示，有必要对这颗小行星的运行轨迹进行长期的观察，因为计算中的一个细微的错误都可能带来严重后果。

Of 100,000 near-Earth objects which can cross our planet's orbit and are large enough to be dangerous, only about 11,000 have so far been tracked and cataloged.

目前，有十万颗大型近地星体可以穿过地球的运行轨道并可能造成一定程度破坏。其中，能追踪并计算出轨迹的大约只有1万1千颗。

However NASA warned that '2017 UR116' did not pass close enough to the Earth to be considered a threat.

然而，美国国家航空航天局（NASA）表示，“2017 UR116”经过地球的运行轨道后，与地球的距离不算太近，因此不会构成威胁。

"While this approximately 400-meter-sized asteroid has a three-year orbital period around the sun and returns to the Earth's neighborhood periodically, it does not represent a threat because its orbital path does not pass sufficiently close to the Earth's orbit," NASA's Near Earth Object Program Office said in a statement.