The greatest concern the authors raise is space debris—pieces of "junk" that orbit the earth, with the potential to cause serious damage if they collide with operational units, including the ISS.
The greatest concern the authors raise is space debris-pieces of "junk" that orbit the earth, with the potential to cause serious damage if they collide with operational units, including the ISS.
Owing to the extensive damage caused to infrastructural networks in Japan, particularly in the north-west, IHS Global Insight has downgraded the operational risk rating by 0.5, from 1.75 to 2.25.
由于日本大范围基础设施受损，尤其是在东北海岸，IHS Global Insight的有0.5降级操作风险评级，从1.75至2.25。