A new satellite instrument suite is now sending back detailed information about the health of the Earth's ozone layer, the shield that protects the world’s population from harmful levels of the sun's ultraviolet radiation.

NASA said on Friday that its Upper Atmosphere Research Satellite (UARS) will most likely miss North America.

NASA said there is a 1-in-3,200 risk that a person who is minding their own business might find themselves being chased down by a defunct satellite the size of a tour bus traveling at 17,500-miles-per-hour.

A new NASA study of Earth's polar ozone layer reinforces scientists' understanding of how human-produced chlorine chemicals involved in the destruction of ozone interact with each other.

A NASA and university study of ozone and carbon monoxide pollution in Earth's atmosphere is providing unique insights into the sources of these pollutants and how they are transported around the world.