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aluminum oxide nanoparticlesAGU Newsroom
•89% Informative
When old satellites fall into Earth ’s atmosphere and burn up, they leave behind tiny particles of aluminum oxide particles that eat away at the protective ozone layer.
The 1987 Montreal Protocol successfully regulated ozone-damaging CFCs to protect the ozone layer, but unanticipated growth of aluminum oxides may push pause on the ozone success story in decades to come.
A typical 250-kilogram ( 550-pound ) satellite with 30% of its mass being aluminum will generate about 30 kilograms ( 66 pounds ) of aluminum oxide nanoparticles.
Most of these particles are created in the mesosphere, 50-85 kilometers ( 30-50 miles ) above Earth ’s surface.
The researchers estimated that by the time the currently planned satellite constellations are complete, every year , 912 metric tons of aluminum ( 1,005 U.S. tons) will fall to Earth .
VR Score
93
Informative language
94
Neutral language
56
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English
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Time-value
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