The US satellite was deployed in 1991 from the space shuttle Discovery on a mission to study the make-up of Earth's atmosphere, particularly its protective ozone layer.
According to the EPA, due to the continual depletion of the ozone, UVB rays are penetrating the earth's atmosphere at an increasing rate.
3
它可以留在大气层的几个星期,并打破下跌到其他有毒化学品,其中一些被怀疑捐款给臭氧层耗竭。
It can remain in the atmosphere for several weeks and break down into other toxic chemicals, some of which are suspected to contribute to the depletion of the ozone layer.