Kiera Jefferson
Space pollution, also known as space junk, space waste, space trash, space garbage, or cosmic debris, refers to defunct human-made objects in space that no longer serve a useful function. Since the dawn of the space age in the 1950s, thousands of rockets have been launched, and an even greater number of satellites have been sent into orbit. Many of these objects, including both active and inactive satellites, are still orbiting Earth, posing an ever-increasing risk of collision. In addition to large objects such as dead satellites, space debris also includes smaller fragments from rocket bodies, spacecraft, and collisions, as well as solidified liquids expelled from spacecraft and even paint flecks. This pollution has led to the International Space Station having to manoeuvre at least a couple of times a year to avoid catastrophic collisions. While space debris does not currently pose a significant risk, it could potentially result in a chain reaction of collisions, creating more debris and eventually rendering Earth's orbit unusable.
| Characteristics | Values |
|---|---|
| Number of active satellites orbiting Earth | 2,000 |
| Number of dead satellites orbiting Earth | 3,000 |
| Number of pieces of space junk bigger than 10 cm | 34,000 |
| Number of pieces of space debris that NASA can track | 23,000 |
| Number of pieces of space debris that are the size of a marble | 500,000 |
| Percentage of pollution in LEO (Low Earth Orbit) | 85% |
| Altitude of LEO | <2,000 km |
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What You'll Learn
Space junk
The accumulation of space junk is a growing problem, with the number of trackable pieces increasing from around 8,000 in 2000 to nearly 30,000 in 2023. This increase is primarily driven by the growth of satellite constellations, with companies like SpaceX and Amazon planning to launch thousands of satellites to achieve global satellite internet coverage. The issue is further exacerbated by collisions or anti-satellite tests, which can create thousands of new pieces of debris. For example, a single collision in 2022 generated over 3,200 pieces of junk, and the deliberate destruction of the Chinese Fengyun-1C spacecraft in 2007 increased the large orbital debris population in Low Earth Orbit (LEO) by approximately 70%.
The presence of space junk poses a significant risk to active satellites and spacecraft, with hundreds of collision avoidance manoeuvres performed every year to prevent potential damage or destruction. The International Space Station (ISS), for instance, regularly manoeuvres to avoid catastrophic collisions with space junk. While space junk does not currently pose a substantial risk to our exploration efforts, experts worry that if left unchecked, it could lead to a cascade of collisions, as predicted by NASA scientist Donald Kessler in 1978. This scenario, known as the Kessler Syndrome, could render Earth's orbit unusable and severely impact our ability to launch satellites and conduct space exploration.
Several technological solutions have been proposed to address the space junk problem. For example, Jason Held of Saber Astronautics in Sydney has developed the DragEN device, which can be attached to spacecraft and satellites. When activated, the DragEN releases a conductive string that gathers electric and magnetic forces, allowing it to deorbit junk back into the Earth's atmosphere, where it combusts safely. Additionally, the voluntary ISO standard has adopted the "25-year rule" for the "LEO protected region," which sets an upper limit on the time a space system should remain in orbit after its mission is completed. However, there is currently no binding international regulatory framework for addressing space junk, and the cost and complexity of removing orbital debris remain significant challenges.
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Rocket launches and emissions
Rocket launches are an integral part of the 21st century. However, they are a source of pollution. The rocket fuel used by many rockets that blasted off from the Baikonur Cosmodrome in Kazakhstan, for instance, contained UDMH (unsymmetrical dimethylhydrazine), which was highly carcinogenic and turned a large area of the Kazakh Steppe into an ecological disaster zone.
Rocket engines emit pollutants such as black carbon or soot, alumina, chlorine, nitrogen oxides, hydroxyl, and water vapour into the atmosphere. These emissions have been the subject of at least three scientific research papers this year, with some scientists worried that these carbon particles can act as a form of geo-engineering by absorbing heat.
The impact of rocket emissions on the atmosphere is uncertain, and the amount of pollution produced is relatively small compared to other industries. However, the comparison may be misleading because aircraft release pollutants within the troposphere and lower stratosphere, while rockets release pollutants from the Earth's surface up to the mesosphere, and pollution released into the upper layers lasts longer. Rocket launches generate between 50-75 tonnes of CO2 per passenger, while a typical long-haul plane flight creates between 1-3 tonnes of CO2 per passenger.
Rocket soot, for instance, can act as an umbrella, absorbing solar radiation. While rocket soot only accounted for about 0.01% of all soot from traditional sources like ships and trucks in 2019, it contributed to an estimated three per cent of global warming caused by soot emissions. The growth in demand for services like satellite internet and space tourism is expected to increase the number of rocket launches, and with it, the amount of pollution produced.
The exact implications of rocket propellant emissions on the climate remain unclear, and further study is needed. However, it is evident that this issue will continue to grow and affect the Earth in the future.
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Satellite pollution
Since the start of the space age in the 1950s, humans have launched thousands of rockets and sent an even greater number of satellites into orbit. Many of these satellites are still in orbit, and the risk of collision increases with each new launch. There are about 4,000 active and inactive satellites in space, which are at risk of colliding with the approximately half a million bits of floating space debris. This debris ranges in size from micrometres to two double-decker buses.
Space debris, also known as space junk, space pollution, or space waste, is any piece of machinery or human-made object left in space that no longer serves a useful function. This includes derelict spacecraft, mission-related debris, and fragmentation debris from the breakup of rocket bodies and spacecraft. In addition, space debris includes smaller fragments from disintegration, erosion, or collisions, such as solidified liquids expelled from spacecraft, unburned particles from rocket motors, and paint flecks.
The presence of space debris poses a significant threat to functioning satellites in orbit. To avoid potential collisions, satellites and even the International Space Station are sometimes forced to manoeuvre out of the way of incoming space debris. These collisions can be catastrophic, resulting in billions of dollars in losses and potentially leaving businesses and industries that rely on satellite technology, such as telecommunications, in disarray.
The issue of space debris has led to the development of various technologies aimed at removing or preventing further accumulation. For example, the DragEN device, weighing just under 100 grams, can be attached to spacecraft and satellites. When activated, it unspools a conductive string that gathers electric and magnetic forces as it travels through the Earth's magnetic field, allowing it to deorbit debris. Additionally, the voluntary ISO standard has adopted the "25-year rule" for the "LEO protected region" below 2,000 km altitude, which encourages space systems to deorbit within 25 years of their mission completion.
While these efforts address the physical dangers of space debris, another aspect of satellite pollution that has come to light in recent years is light pollution. The increase in reflective spacecraft has drawn concern from the scientific community, particularly astronomers. The growing number of satellites in low Earth orbit (LEO) has led to a significant increase in light pollution, impacting ground-based astronomy and astrophotography. To address this issue, the University of Surrey has developed Vantablack 310, an ultra-black paint that can significantly reduce satellite brightness and minimise disruption to astronomical research.
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Space debris collisions
Space debris is a growing problem, with about 4,000 active and inactive satellites in orbit around Earth, all at risk of colliding with the approximately half a million bits of floating space debris. These collisions can be catastrophic, with the potential to create thousands of new pieces of dangerous debris.
The first accidental in-orbit collision between two satellites occurred in 2009 when a privately owned American communication satellite, Iridium-33, and a Russian military satellite, Kosmos2251, collided and were destroyed. This collision generated more than 2300 trackable fragments, some of which have since re-entered the atmosphere and burned up.
The growth of space debris will make tracking and avoiding debris more complicated and costly, requiring satellites to perform extra manoeuvres to avoid collisions and carry extra fuel. In addition, critical areas of satellites may need to be shielded from collisions with small debris.
While space debris does not currently pose a significant risk to space exploration, the probability of catastrophic collisions will increase as the number of debris objects in space grows. It is important to address the issue of space debris and develop methods for its removal to prevent it from becoming an unmanageable problem in the future.
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Environmental impact
Environmental pollution is a critical global issue that significantly impacts the environment and living organisms, including humans. It refers to the contamination of the Earth's natural resources, such as water, land, and air, by harmful substances. While environmental pollution is not a new phenomenon, it remains a pressing concern due to its severe long-term consequences.
One significant aspect of environmental pollution is air pollution, which has detrimental effects on both human health and the planet. According to the World Health Organization (WHO), air pollution, including indoor and outdoor pollution, causes approximately seven million premature deaths worldwide each year. The primary sources of air pollution include vehicle emissions, fuel oils, natural gas used for heating, manufacturing by-products, and power generation, especially from coal-fueled plants. Air pollution exacerbates climate change, contributes to biodiversity loss, and harms ecosystems. It also affects the water cycle by providing condensation surfaces for water vapour to transform into liquid, leading to increased cloud formation. Additionally, air pollutants mix with rainwater, making it acidic. This acid rain has detrimental effects on soil health, plant growth, and aquatic life.
Water and soil pollution are also significant environmental concerns. Soil pollution, caused by industrial waste and chemical pollutants, affects the ability of plants to absorb water and nutrients, impacting agriculture and ecosystems. Water pollution, caused by the discharge of pollutants into water bodies, has severe ecological and health consequences.
Space debris is another emerging issue with potential environmental implications. The increasing number of satellites and mega-constellations in space poses risks to the climate and environment. Satellite re-entries from mega-constellations can release hazardous levels of alumina into the upper atmosphere, leading to pernicious solar radiation effects. Additionally, the lack of effective regulation in the space industry exacerbates the problem, as there are no meaningful penalties to deter rule-breaking.
To address these environmental challenges, various solutions have been proposed. These include transitioning to cleaner fuels and industrial processes, such as renewable energy sources, improving fuel efficiency, and adopting electric vehicles. Additionally, the implementation of carbon tax systems and integrated pollution management policies can provide economic incentives to reduce emissions and combat climate change. Furthermore, advancements in CRISPR-Cas9 technology have enabled the editing of microorganisms and plants to enhance their ability to degrade and accumulate environmental pollutants, offering promising bioremediation solutions.
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Frequently asked questions
As of January 2022, the amount of material orbiting the Earth exceeded 9,000 metric tons. There are about 2,000 active satellites orbiting Earth at the moment, with 3,000 dead ones also in orbit. There are also around 34,000 pieces of space junk bigger than 10 centimetres in size and millions of smaller pieces.
Space pollution, or space junk, is any piece of machinery or debris left by humans in space. This includes dead satellites, rocket parts, flecks of paint, nuts, bolts, and even a spatula.
Space pollution has been accumulating since the first human-made satellite, Sputnik 1, was launched in 1957. Since then, there have been more than 4,700 launches around the globe, with more than 5,000 rocket launches placing satellites in orbit. Some space junk also results from collisions or anti-satellite tests in orbit.
Space junk can impact other objects at over 22,300 mph, faster than a speeding bullet. This can cause pits and dings in satellites, telescopes, and other orbiting objects. In the case of a collision with a larger piece of debris, the results could be catastrophic. In 2009, two satellites collided above Siberia, bursting into thousands of pieces of debris.
The United Nations Office for Outer Space Affairs has worked with NASA and the European Space Agency to develop guidelines on space debris mitigation. Additionally, several technologies are being developed to help remove space debris, such as an electronic space whip, giant magnets, harpoons, and nets.
