One of these missions , a satellite called aeronomy of ice in the mesosphere , or aim , was launched in april to study so - called noctilucent clouds ( depicted above ) , the highest layer of clouds in the atmosphere 任务其一，今年4月该局发射了一颗名为“中层大气高空冰探测” （简称aim ）的卫星以研究所谓的夜光云（如上图所示）这是大气层中最高处的云层。
