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Climate Change Threatens Satellite Sustainability in Earth's Orbit

New research shows greenhouse gas emissions are shrinking the upper atmosphere, increasing risks of collisions and space debris accumulation.

Captured by astronaut Don Pettit aboard the International Space Station (ISS), this long-exposure photograph showcases Earth's city lights, the upper atmosphere's airglow, and streaked stars. The bright flashes at the center are reflections of sunlight from SpaceX's Starlink satellites in low-Earth orbit.
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Overview

  • Greenhouse gases are causing the upper atmosphere to cool and contract, reducing its density and slowing the natural removal of space debris.
  • This change threatens the carrying capacity of low Earth orbit, where most satellites operate, potentially reducing it by 50-66% by 2100 if emissions continue to rise.
  • The shrinking atmosphere extends the lifespan of space debris, increasing risks of collisions that could trigger a cascading chain reaction known as Kessler syndrome.
  • The rapid growth of satellite launches, including megaconstellations like SpaceX's Starlink, is already straining orbital capacity and safety.
  • Researchers emphasize that reducing greenhouse gas emissions is critical to maintaining sustainable satellite operations and mitigating future debris risks.