On the morning of January 11, 2007, a Chinese direct-ascent interceptor struck the dead weather satellite Fengyun-1C at an altitude of 865 kilometers. The collision at orbital velocity tore the spacecraft into thousands of fragments—and turned near-Earth space into a hazard zone that will not dissipate within a human lifetime.
Satellite Fengyun-1C had been dead for several years. Launched into polar orbit in May 1999, it had completed its service life and fallen silent, becoming a mute metal box weighing about 750 kilograms. Chinese military forces selected it as a target for testing anti-satellite weapons—a technology the USSR and USA had explored during the Cold War but had publicly abandoned by the early 21st century.
The kinetic interceptor carried no explosives. Physics did the work: at a closing velocity on the order of 8 kilometers per second, impact energy turns metal into a cloud of fragments. The U.S. Space Surveillance Network recorded the result within hours—the number of tracked objects in orbit rose sharply and irreversibly. By month's end, the surveillance network was tracking more than 2,300 fragments, with over 1,900 entered into the official catalog. But this was only the tip of the iceberg: small debris—the size of a bolt or hull fragment—went undetected, though their impact energy equals that of an artillery shell hit.
The altitude of 865 kilometers was a death sentence. At low orbits—below 400 kilometers—atmospheric drag works quickly: debris loses velocity over months or years and burns up entering the dense layers. But at nine hundred kilometers, the atmosphere is so rarefied that fragments maintain orbit for decades. Mathematical models showed: some debris from Fengyun-1C would remain in orbit until the 2050s, and some even longer.
The test proceeded without public warning. China's Ministry of Foreign Affairs confirmed the fact only after several days, without disclosing technical details. For the space community, this was not just a show of force but a violation of an unspoken taboo: since 1985, when the U.S. conducted its last destructive test against satellite Solwind P78-1, major powers had avoided creating long-lived debris at high orbits.
Orbital velocity at an altitude of 800–900 kilometers is about 7.4 kilometers per second. This isn't just a number—it's energy that turns a collision with an object massing 10 grams into an impact equivalent to a hand grenade explosion. Fragments of Fengyun-1C scattered into elliptical orbits with varying inclinations, crossing the trajectories of hundreds of active satellites.
The main danger isn't a direct hit from a large fragment but the statistics of multiple crossings. Each fragment passes through certain orbital points twice per revolution, creating high-risk zones. For satellites in nearby orbits—remote sensing science craft, meteorological platforms—the probability of close approach with Fengyun-1C debris became a measurable quantity. Operators began receiving automatic conjunction warnings, forcing them to plan evasive maneuvers, expend fuel, and shorten active service life.
The debris cloud is not static. Gravitational perturbations from the Moon and Sun, irregularities in Earth's gravitational field, residual atmospheric drag—all of this slowly changes fragment orbits, spreading them through space. Several years after the test, Fengyun-1C debris formed a ring structure around Earth, with maximum density at the original altitude but with "tails" descending lower and rising higher.
By 2010, Fengyun-1C debris had come close to the International Space Station more than once—their elliptical orbits reached its altitude of about 400 kilometers at apogee, though the bulk of debris remained higher. This didn't mean constant threat: conjunctions were rare but predictable. The real blow fell on satellites in polar orbits at 700–900 kilometers—exactly where Fengyun-1C debris density remained highest.
In 2013, the Russian microsatellite BLITS, designed for laser ranging, changed its rotation after colliding with an untracked object. Though there was no direct proof of connection to Fengyun-1C debris, temporal and orbital parameters pointed to high probability. The satellite became unsuitable for precision measurements.
The U.S. response was harsh and public. National Security Council spokesman Gordon Johndroe stated on behalf of the White House that such weapons were "inconsistent with the spirit of cooperation" both countries expect in civil space. The Pentagon published long-term risk assessments, noting that debris threatened American military and commercial satellites. The European Space Agency and Roscosmos joined the criticism, emphasizing that debris recognizes no borders and creates danger for all participants in space activity.
But behind the rhetoric stood complex geopolitical reality. China had not violated international law—the Outer Space Treaty of 1967 prohibits placing weapons of mass destruction in orbit but does not regulate testing of conventional anti-satellite systems. Article IX of the treaty requires "due regard" for the interests of other states, but this formulation has no enforcement mechanism.
A year later, on February 20, 2008, the U.S. demonstrated its own anti-satellite capability by intercepting the uncontrolled reconnaissance satellite USA-193. The official reason—prevent toxic hydrazine fuel from falling on populated areas. But the choice of target and operation timing carried obvious political subtext: the Pentagon showed it possessed analogous technology while choosing an intercept altitude of about 250 kilometers, where most debris would deorbit within weeks. 174 fragments were cataloged, and nearly all disappeared within a year.
India joined the club of countries with anti-satellite capabilities on March 27, 2019, destroying its own satellite Microsat-R at an altitude of about 300 kilometers as part of Mission Shakti. Prime Minister Narendra Modi announced success in a televised address, calling India a "space power." NASA publicly criticized the test, stating that debris created brief but measurable risk for the ISS. Most fragments deorbited within months, but the political signal was sent: space rivalry had become multipolar.
On November 15, 2021, Russia conducted an anti-satellite weapon test, striking its own defunct satellite Kosmos-1408 at an altitude of about 480 kilometers. The satellite, massing about 1,750 kilograms—more than twice the weight of Fengyun-1C—broke into more than 1,500 tracked fragments. The debris orbit intersected with the trajectory of the International Space Station, where seven people were present at that moment, including two Russian cosmonauts.
NASA received automatic conjunction warning several hours after the test. The crew was ordered to close hatches and take positions in the docked spacecraft—Crew Dragon and Soyuz MS-19—in case emergency evacuation became necessary. The station passed through the debris cloud twice in the first 24 hours; collision risk remained elevated for several days.
NASA Administrator Bill Nelson called the test "irresponsible and destabilizing," adding that Russia's behavior was "reckless and dangerous." The U.S. State Department expressed "deep concern." China resisted the temptation to criticize directly: Foreign Ministry spokesman Zhao Lijian limited himself to saying they "paid attention to the reports" and it was too early to comment. Even within Russia critical voices sounded: Roscosmos head Dmitry Rogozin assured that debris did not threaten the station, while according to the American side, the state corporation's leadership had not been warned about the test timing.
The altitude of 480 kilometers meant Kosmos-1408 debris would deorbit faster than Fengyun-1C fragments but slower than debris from U.S. and Indian tests. Models predicted that most fragments would disappear in 5–10 years, but the highest portions of the cloud could linger for decades.
NASA astrophysicist Donald Kessler predicted the scenario in 1978: upon reaching critical density of objects in orbit, collisions would begin generating new debris faster than atmospheric drag removes old debris. A cascade reaction would turn certain orbital altitudes into zones unsuitable for space activity. For decades this remained a theoretical threat.
Fengyun-1C did not trigger the cascade but made it mathematically closer. According to European Space Agency data, the 2007 test became the largest in terms of debris created in the entire history of observations—and for years increased background collision probability in that sector of low orbit.
The first accidental collision of two intact satellites occurred on February 10, 2009, when American commercial craft Iridium 33 collided with Russian military satellite Kosmos-2251 over Siberia. Both satellites—with combined mass of about 1,460 kilograms—were destroyed, creating another 2,300 tracked fragments. The connection with Fengyun-1C debris was indirect but symbolic: space had become more crowded, and the probability of such events was no longer zero.
Current models show that the orbital band from 700 to 1,000 kilometers—exactly where Fengyun-1C was destroyed—stands on the edge of sustainability. If several more major collisions occur at these altitudes, the rate of new debris formation will exceed the rate of natural cleanup. Then the cascade will become irreversible—and these orbits will be lost for centuries.
After 2007, the space community began discussing "norms of responsible behavior," avoiding legally binding formulations. In 2010, the Inter-Agency Space Debris Coordination Committee issued updated debris mitigation guidelines, including a requirement to deorbit satellites within 25 years of mission end. These rules are voluntary, but were adopted by most space agencies and commercial operators.
The UN passed several resolutions calling for transparency and restraint in space. In 2013, a Group of Governmental Experts agreed on recommendations for transparency and confidence-building measures, but they lacked the force of international treaty. Attempts to agree on banning anti-satellite weapons ran into a fundamental contradiction: how to distinguish a weapons test from a commercial servicing satellite or debris removal system? Dual-use technologies blur boundaries.
In April 2022, several months after the Russian test, the U.S. announced a unilateral moratorium on destructive anti-satellite tests and called on other countries to follow suit. This is not a ban on possessing the technology but a commitment not to create long-lived debris. Canada, New Zealand, Germany, Japan, and South Korea joined the initiative within a year. China and Russia did not publicly support the moratorium, though they have not conducted new destructive tests since the announcement.
In December 2022, the UN General Assembly passed a resolution calling on states to refrain from destructive anti-satellite tests. 155 countries voted for it, including the U.S., UK, and France. Russia and China voted against. India abstained, despite its own 2019 test.
A treaty never appeared. The Outer Space Treaty of 1967 remains the primary legal document, but it does not directly regulate anti-satellite weapons. Attempts to expand its provisions met resistance: powers possessing the technology don't want to tie their own hands, and those seeking restrictions lack levers for enforcement. Space remains a domain where the norm is not law but an aggregate of precedents and unilateral promises.
By 2026—nearly two decades after the test—more than 3,000 tracked fragments of Fengyun-1C remain in the space object catalog. Some debris deorbited due to atmospheric drag, enhanced by solar activity that expands the upper atmosphere layers. But a significant portion remains—and will remain—at altitudes where atmospheric rarefaction makes natural cleanup a process stretched over decades.
Every day satellite operators receive conjunction warnings. When distance is forecast at less than a kilometer, an evasive maneuver is planned. If a satellite lacks propulsion—like many cubesats and small science craft—there's nothing left but to wait and recalculate probability. Most conjunctions pass without consequence, but statistics are relentless: each trajectory crossing is a dice roll with very low but non-zero probability of catastrophe.
The 2007 test did not cause war, did not halt space activity, did not trigger irreversible cascade. It changed the baseline risk level—that background probability faced by everyone working in low Earth orbit. It's like radiation after an accident: not immediate death but increased statistics, stretched over years and generations of satellites.
China has not conducted destructive tests at high orbits since, but has not renounced the technology either. Russia, the U.S., India—all retained the capability to repeat January 11, 2007, but so far refrain. This is not an agreement but a pause—a fragile equilibrium based on understanding that the next debris cloud may be the last permissible one.