Megaconstellations Could Pose Significant Environmental Risks
Burning Up the Atmosphere
SpaceX’s Starlink megaconstellation might be hindering the Earth’s ozone layer from healing, according to new research.
In a study by the University of Southern California, scientists highlighted the detrimental effects of satellites releasing pollutants like aluminum oxides into the upper atmosphere during reentry. These pollutants could be causing “significant ozone depletion,” crucially affecting the Earth’s protective shield against UV radiation.
While rocket launch emissions have been a primary focus, the burning of decommissioned satellites is now emerging as a critical environmental concern. SpaceX, with nearly 6,000 Starlink satellites already in orbit and plans for tens of thousands more, is at the forefront of this issue, prompting similar ambitions from competing satellite constellations.
“Only in recent years have people started to think this might become a problem,” said Joseph Wang, a coauthor of the study and an astronautics researcher at the University of Southern California. “We were one of the first teams to look at what the implications of these facts might be.”
Poking Holes in the Atmosphere
Due to the difficulty in measuring pollutants released by burning satellites, scientists have had to estimate their environmental impacts. The team studied the interactions of common satellite metals, discovering a nearly 30 percent increase in atmospheric aluminum in 2022 alone.
Their findings indicate that a 550-pound satellite can produce around 66 pounds of aluminum oxide nanoparticles during reentry, taking up to 30 years to settle into the stratosphere. If satellite constellations continue to expand, aluminum oxide levels could surge by an alarming 646 percent annually over natural levels.
“The environmental impacts from the reentry of satellites are currently poorly understood,” the researchers emphasized. “As reentry rates increase, it is crucial to further explore the concerns highlighted in this study.”