Space debris

In addition to derelict human-made objects left in orbit, space debris includes fragments from disintegration, erosion, or collisions; solidified liquids expelled from spacecraft; unburned particles from solid rocket motors; and even paint flecks.

The smallest objects cause damage akin to sandblasting, especially to solar panels and optics like telescopes or star trackers that cannot easily be protected by a ballistic shield.

According to a report published in January 2025, scientists are encouraging vigilance around closing airspace more often to avoid collisions between airline flights and space debris reentering the earth's atmosphere amid an increasing volume of both.

[17] Following a destructive event, the explosion of SpaceX's Starship Flight 7 on January 16, 2025, the U.S. Federal Aviation Administration (FAA) slowed air traffic in the area where debris was falling.

NASA later published modified versions of the database in two-line element sets,[21] and beginning in the early 1980s, they were republished in the CelesTrak bulletin board system.

[23] Some were deliberately caused during anti-satellite weapon (ASAT) testing in the 1960s, and others were the result of rocket stages blowing up in orbit as leftover propellant expanded and ruptured their tanks.

[31] A new battery of studies followed as NASA, NORAD, and others attempted to better understand the orbital environment, with each adjusting the number of pieces of debris in the critical-mass zone upward.

As of October 2009[update], it, the upper stage of Vanguard 1's launch rocket and associated piece of debris, are the oldest surviving artificial space objects still in orbit and are expected to be until after the year 2250.

Lower stages, like the Space Shuttle's solid rocket boosters or the Apollo program's Saturn IB launch vehicles, do not reach orbit.

[101] Brian Weeden, U.S. Air Force officer and Secure World Foundation staff member, noted that the 2007 Chinese satellite explosion created an orbital debris of more than 3,000 separate objects that then required tracking.

[102] On 20 February 2008, the U.S. launched an SM-3 missile from the USS Lake Erie to destroy a defective U.S. spy satellite thought to be carrying 450 kg (1,000 lb) of toxic hydrazine propellant.

[108][failed verification] However, since the risk to spacecraft increases with exposure to high debris densities, it is more accurate to say that LEO would be rendered unusable by orbiting craft.

[116][117][118] On 22 January 2013, BLITS (a Russian laser-ranging satellite) was struck by debris suspected to be from the 2007 Chinese anti-satellite missile test, changing both its orbit and rotation rate.

The Shuttle was later flown tail-first to take a greater proportion of the debris load on the engines and rear cargo bay, which are not used in orbit or during descent, and thus are less critical for post-launch operation.

[135] As another method to reduce the risk to humans on board, ISS operational management asked the crew to shelter in the Soyuz on three occasions due to late debris-proximity warnings.

[26] A number of scholars have also observed that institutional factors – political, legal, economic, and cultural "rules of the game" – are the greatest impediment to the cleanup of near-Earth space.

By evaluating these measures in economic terms, the study aims to inform cost-effective strategies for debris management, highlighting that methods like rapid deorbiting of defunct spacecraft can significantly reduce risks in space.

[175] The US updated the Orbital Debris Mitigation Standard Practices (ODMSP) in December 2019, but made no change to the 25-year rule even though "[m]any in the space community believe that the timeframe should be less than 25 years.

[176] In 2002, the European Space Agency (ESA) worked with an international group to promulgate a similar set of standards, also with a "25-year rule" applying to most Earth-orbit satellites and upper stages.

[179] By 2006, the Indian Space Research Organization (ISRO) had developed a number of technical means of debris mitigation (upper stage passivation, propellant reserves for movement to graveyard orbits, etc.)

They "can be adopted voluntarily by a spacecraft manufacturer or operator, or brought into effect through a commercial contract between a customer and supplier, or used as the basis for establishing a set of national regulations on space debris mitigation.

[175] Holger Krag of the European Space Agency states that as of 2017 there is no binding international regulatory framework with no progress occurring at the respective UN body in Vienna.

[26] On 7 January 2010 Star, Incorporated reported that it received a contract from the Space and Naval Warfare Systems Command for a feasibility study of the ElectroDynamic Debris Eliminator (EDDE) propellantless spacecraft for space-debris removal.

[213] Although a test-bed device was scheduled to launch on a Space Shuttle in 2003, international agreements banning powerful laser testing in orbit limited its use to measurements.

In order to complete its planned experiments the platform is equipped with a net, a harpoon, a laser ranging instrument, a dragsail, and two CubeSats (miniature research satellites).

In terms of governance mechanisms, a top-down centralized one is less suitable to tackle the complex debris problem due to the increasing number of space actors.

[239] Instead of joining in a coordinated way, a great deal of SSA programs and national databases run parallel to each other with some overlaps, hindering the formation of a collaborative monitoring system.

[243] The exclusion of private actors largely reduces the effectiveness of the committee's role in making collective-choice arrangements that reflect the interests of all space users.

[258][259] Until the End of the World (1991) is a French sci-fi drama set under the backdrop of an out-of-control Indian nuclear satellite, predicted to re-enter the atmosphere, threatening vast populated areas of the Earth.

[261] In season 1 of Love, Death & Robots (2019), episode 11, "Helping Hand", revolves around an astronaut being struck by a screw from space debris which knocks her off a satellite in orbit.

Infographic showing the space debris situation in different kinds of orbits around Earth
Large camera, with a man standing next to it for scale
Baker-Nunn cameras were widely used to study space debris.
Debris graph of altitude and orbital period
Gabbard diagram of almost 300 pieces of debris from the disintegration of the five-month-old third stage of the Chinese Long March 4 booster on 11 March 2000
NASA computer-generated image of debris objects in Earth orbit, c. 2005
Objects in Earth orbit including fragmentation debris. November 2020 NASA:ODPO
Objects in Earth orbit including fragmentation debris, November 2020, NASA: ODPO
Debris density in low Earth orbit
Illustration of a satellite breaking up into multiple pieces at higher altitudes
Small, round satellite with six rod antennas radiating from it
Vanguard 1 is expected to remain in orbit for 240 years. [ 68 ] [ 69 ]
A drifting thermal blanket photographed in 1998 during STS-88
Spent upper stage of a Delta II rocket, photographed by the XSS 10 satellite
Simulation of Earth from space, with orbit planes in red
Known orbit planes of Fengyun -1C debris one month after the weather satellite's disintegration by the Chinese ASAT
Large glass pit (damage)
A micrometeoroid left this crater on the surface of Space Shuttle Challenger 's front window on STS-7 .
View of an orbital debris hole made in the panel of the Solar Max satellite
Bullet-like hole in metallic material
Space Shuttle Endeavour had a major impact on its radiator during STS-118 . The entry hole is about 5.5 mm (0.22 in), and the exit hole is twice as large.
Space station with Earth as the background
Debris impacts on Mir 's solar panels degraded their performance. The damage is most noticeable on the panel on the right, which is facing the camera with a high degree of contrast. Extensive damage to the smaller panel below is due to impact with a Progress spacecraft.
Growth of tracked objects in orbit and related events; [ 139 ] efforts to manage outer space global commons have so far not reduced the debris or the growth of objects in orbit
Cylindrical rocket fragment on sand, with men looking at it
Saudi officials inspect a crashed PAM-D module in January 2001.
Large, cylindrical spacecraft against Earth background, photographed from the Challenger space shuttle
The Long Duration Exposure Facility (LDEF) is an important source of information on small-particle space debris.
Space debris identified as WT1190F, burning up in a fireball over Sri Lanka
After reentry, Delta 2 second stage pieces were found in South Africa.
A computer-generated animation by the European Space Agency representing space debris in low earth orbit at the current rate of growth compared to mitigation measures being taken
Graph with blue line
Spatial density of LEO space debris by altitude, according to 2011 a NASA report to the United Nations Office for Outer Space Affairs [ 182 ]
Graph with red line
Spatial density of space debris by altitude according to ESA MASTER-2001, without debris from the Chinese ASAT and 2009 collision events
Perseverance' s backshell sitting upright on the surface of Jezero Crater