Rocket Pollution is a Rising Concern for Our Atmosphere

In a surprising revelation, Purdue University’s atmospheric research aircraft flying 19km above Alaska detected significant traces of refined metals in the stratosphere. These traces are not from meteoroids or cosmic dust, which have been naturally present in our atmosphere. Instead, the increased activity in space travel and the sheer number of satellites and rockets we send upwards are becoming a concern.

Professor Dan Cziczo, who’s part of the research team, pointed out the vast number of rockets and satellites entering and re-entering our atmosphere. They leave behind a trail of metals, which might change our atmosphere in ways we still don’t grasp.

Historically, the metals found in our atmosphere were primarily from meteoroids and cosmic dust burning up upon entering our atmosphere. Scientists have been monitoring this “meteor smoke” for decades. But recently, the composition began shifting, leading researchers to pinpoint the rise in space travel as the cause.

The culprits? Elements like Lithium, Aluminium, Copper, and Lead, prominent in spacecraft construction, are now floating in vast quantities in the upper atmosphere. Just to give you a sense: one SpaceX Falcon 9 rocket, made of an aluminium-lithium alloy, weighs a whopping 550 tons. Over the last 13 years, 270 of these rockets have been launched, and this frequency is anticipated to increase.

But there’s more at stake. The stratosphere’s chemistry is being altered. Around 10% of large sulfuric acid particles, crucial for the ozone layer, now contain spacecraft-associated metals. With an estimated 50,000 low-Earth orbit satellites by 2030, this figure could skyrocket to 50%.

Dr. Alice Gorman from Flinders University also cautions against the potential impact on other planets. While the effects on other celestial bodies are still minimal, it’s something we need to be wary of as space exploration intensifies.