The ozone layer is on the mend but not completely out of the woods yet.
These satellites are made of metals such as aluminum and titanium and contain other potentially toxic substances. Scientists worry that as these satellites burn, they may release harmful chemicals that could damage the recovering ozone layer.
Aluminum oxides, which may be produced during the burn-up of the aluminum-based spacecraft bodies, have beenThe burning of titanium could generate titanium oxides, which, Ross said, can alter the optical properties of the surrounding air. There are other contentious elements present in satellite components — cobalt and lithium in batteries, traces of gold and lead — all elements that are not otherwise found in the upper atmospheric layers.
"New supersonic and hypersonic aircraft are being developed that can release water vapor and nitrogen oxides into the stratosphere," Paul Newman, the chief scientist for Earth sciences at NASA Goddard Space Flight Center, who collaborated on the WMO report, told Space.com."At this point, there are not enough of them, but in the future, if you began to fly thousands of these aircraft in the stratosphere, it could have a significant effect.
New rocket propulsion systems are being developed that consume presumably greener hydrogen and methane fuel, but scientists warn that not enough is known about the interaction of the exhaust fumes from these rocket motors with the upper layers of Earth's atmosphere, the stratosphere, which harbors the ozone layer, and the even higher mesosphere.
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