The researchers observed 95 asteroids in the vicinity of our planet, called near-Earth asteroids (NEAs).
研究人员们观测了95颗地球附近的小行星，它们被称为近地小行星(NEAs)。
That's according to a survey of the sky that NASA is calling the most accurate census yet of near-Earth asteroids.
这是根据美国宇航局(NASA)称之为“最准确的”一次近地小行星普查的结论。
Strategic DRMs, such as missions to near-Earth asteroids (NEAs), use upgraded systems along with conceptual, currently undeveloped systems.
战略DRMs，如到近地小行星（NEAs）的任务，使用概念性升级系统，目前尚未开发的系统。
The mission is designed to uncover objects never seen before, including the coolest stars, the universe's most luminous galaxies and some of the darkest near-Earth asteroids and comets.
该任务计划发现以前从未见过的目标，包括最冷的恒星、宇宙中最明亮的星系和一些最暗的近地小行星和彗星。
Sept. 29, 2011. NASA held a conference for updating information about the database of near-Earth asteroids in our solar system, tracked by Wide-field Infrared Survey Explorer (WISE) telescope.
2011年9月29日。美国航空航天局举行一个会议更新在我们的太阳系中，有关近地小行星的数据库信息，由广角红外线探测望远镜（WISE）跟踪的。
The compounds, which include ammonia, carbon dioxide, carbon monoxide, sodium and, surprisingly, silver, could have come from the Earth, from the moon's interior, or from comets and asteroids.
这些物质,包括氨、二氧化碳、一氧化碳、钠时,让人吃惊的是,银,可能来自地球、月亮的内部,还是来自彗星和小行星。
Such asteroids would rapidly have adopted orbits that cut across those of the inner planets, including Earth.
这些小行星在横越其它内部行星后就会快速改变轨道，其中也包括地球。
"The asteroids in the most Earth-like orbit are the ones that threaten us most, but they're also the ones that are easiest to get to," Yeomans says.
约曼斯说：“在那些小行星中，与地球轨道最接近的，对我们的威胁也最大，但是他们也是我们最容易登陆的星球。”
It provides information on NASA's missions to study comets, asteroids and near-Earth objects, and also provides the basic facts and the very latest in science and research on these objects.
它提供了NASA研究彗星，小行星和近地天体的任务的信息，也提供了有关这些天体的基本事实和最近的科学研究成果。
Even though asteroids of roughly that size fall to Earth a few times a year, the NEO Program telescopes often miss them because the survey is tuned to search for larger, more distant rocks.
即使每年都有几颗类似体积的小行星飞临地球，近地天体项目的望远镜也时常观测不到，因为巡天望远镜是为寻找较大，较远的太空岩石。
On its own, the tiny moon might have escaped with less damage, but it was too close to the Earth. So, asteroids heading for impact with Earth, hit the moon instead.
个头并不大的月亮自己引来的损害可能不会太大，但因为它离地球太近了，于是，原本飞向地球的小行星砸向了月亮。
Thousands of near-Earth objects (asteroids and comets) will have been analyzed by telescopes on the Moon and by spacecraft that were launched from the Moon.
将通过设在月球的天文望远镜和由月球发射的宇宙飞船，对数以千计的近地目标星体（小行星和彗星）进行分析研究。
The theory that has developed is that asteroids in the the Asteroid Belt between Mars and Jupiter may have produced smaller meteorites which have shot off into space and landed on Earth.
现在已经证实的理论是，火星和木星之间的小行星带的小行星可能会产生较小的陨石，进入太空在地球上降落。
Hundreds of midsize asteroids near Earth are discovered every year, but at this rate, it would take decades to locate all of them and see if they pose a threat.
每年都有数百颗中型小行星在地球附近被发现，但按这一速度，还将需要几十年时间。
They could similarly sample near-Earth objects like asteroids.
他们同样可以在像小行星这样的近地物体的提取样本。
But there are also thousands of asteroids whose orbits put them on a collision course with Earth.
但是仍旧有成千上万颗小行星，它们的轨道是要与地球碰撞的。
Of the 20 fresh, pristine-looking asteroids in their sample, each had traveled close to Earth - within the distance from the Earth to the moon - in the past 500, 000 years.
结果在他们的样本中有20个表面未受腐蚀的小行星都曾靠近过地球，在过去的50万年间，它们离地球的距离都曾在地月距离之内。
They are probably also the explanation for the fact that, over the past 100m years or so, the number of asteroids that have hit the Earth is about twice that which would have been expected.
也许还可能解释这样的事实，那就是在过去大约1亿年间，撞击地球的小行星的数量是原来预计的两倍。
NASA estimates there are 19 500 asteroids at least 330 feet wide - large enough to detect with telescopes - within 28 million miles of Earth.
这些物体是大量存在的，据NASA估计，仅地球28 000 000英里范围内超过330英尺宽的小行星就达19 500个，使用望远镜就可以观测到。
Of the 20 fresh, pristine-looking asteroids in their sample, each had traveled close to Earth within the distance from the Earth to the moon in the past 500,000 years.
在这些样本中，有20个新鲜的、看起来是没有受损的小行星，在过去500000年里都曾经飞临地球- - - - -在地月距离之内。
It shares this with a number of smaller asteroids whose orbits suggest they were spalled off in the collision, and with about 5% of the meteorites which fall to Earth.
灶神星和许多更小的小行星共同具有这种特征谱。这些更小行星的轨道表明它们是那次碰撞中剥落下来的，而其中大约5%的陨石落到了地球上。
The discovery also "provides additional support for the theory that life's ingredients were delivered to the Earth by asteroids," he said.
他说，“这项研究也能够提供一种额外的理论支持以证明陨石上的生命元素曾经被传送回地球。”
Asteroids pose the greatest danger of all to Earth, however, astronomers say, and here Jupiter's influence is hardly assuring.
小行星对地球的威胁最大，然而，天文学家说，在这一点上很难说木星的作用是好是坏。
Asteroids of this size pass close by Earth every six years or so, and there's a small chance one could hit Earth.
这样大小的小行星造访地球基本六年左右一次，也有小概率会撞击地球。
Scientists could look for such hallmarks of alien technology on Earth and the moon, in near space, on Mars and among the asteroids.
科学家可以在地球和月球以及周围区域寻找地外技术的标志。
Compared to planet Earth, some asteroids are tiny, measuring less than a mile in diameter.
跟地球比起来，有一些小行星非常小，测量直径还不到一哩。
Compared to planet Earth, some asteroids are tiny, measuring less than a mile in diameter.
跟地球比起来，有一些小行星非常小，测量直径还不到一哩。
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