The European Space Agency’s annual report on the space environment warns that space debris is increasing rapidly. There are far more nonfunctional satellites than working ones, which makes the problem worse. The ESA warns that collision risk in low Earth orbit is rising and will continue to escalate. Even without more launches, the amount of debris will keep growing, because fragmentation creates new pieces faster than old debris can fall back into the atmosphere — a process called the Kessler syndrome.
“This chain reaction could eventually render some orbits dangerous and unusable, as debris continues to collide and fragment, creating a cascading effect,” the ESA said. That means it’s not enough to just stop adding new debris; we need active cleanup efforts to remove debris from orbit.
What else did the report say? Current monitoring programs track about 40,000 objects in low Earth orbit, roughly 11,000 of them active satellites. But the estimated total amount of debris is much larger. The ESA estimates about 54,000 fragments larger than 10 centimeters, 1.2 million pieces between 1 and 10 centimeters, and roughly 130 million particles between 1 millimeter and 1 centimeter. Tiny, high-speed particles can still severely damage operational satellites and spacecraft, including the International Space Station and the Hubble Space Telescope.
There is some good news. Science Alert reported that about 90 percent of rocket bodies in low Earth orbit currently leave key orbits under the return-to-atmosphere standards that applied until 2023, with more than half coming down in a controlled way. About 80 percent also meet the new, stricter rule requiring orbit clearance within five years, which the ESA adopted in 2023.
Cleaning up near-Earth space will be a complex task that requires global cooperation. Only through collective effort can we preserve Earth’s orbit as a usable environment for satellites and missions.
