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)。

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。

At the moment, about 9,000 NEAs are known, most of them courtesy of ground-based programmes looking for bodies that might one day hit Earth.

目前已探明的近地小行星约有9000颗，其中大部分是地面计划在寻找可能撞击地球的天体时探测到的。

They used a process called spectroscopy to determine their colors, to see if they were weathered or fresh, and then combined this data with measurements of the NEAs' orbital histories.

他们有光谱分析的方法测定它们的颜色，看它们是饱经风霜的还是新鲜的，然后把这个数据和近地小行星的轨道历史测量数据结合起来分析。