Kiera Jefferson
Since the first launch in 1957, humanity has been sending thousands of objects into space, and all of this space junk is polluting the atmosphere. As of 2020, there were 8,000 metric tons of debris in orbit, with 85% pollution in low Earth orbit (LEO). This debris includes everything from paint flecks to inoperative spacecraft, and it can smash into functioning satellites, creating a ripple effect of more and more debris. This problem is exacerbated by the rapid growth of satellite mega-constellations, which poses a significant risk to the climate and environment. While NASA and other organizations have developed guidelines and technologies to mitigate the growth of space debris, there is a lack of comprehensive legal regimes and cost assignment structures to reduce it effectively. The accumulation of space junk threatens future space exploration and could have detrimental effects on Earth's environment.
| Characteristics | Values |
|---|---|
| Number of objects in space since 1957 | Thousands |
| Nature of objects | Natural or artificial |
| Nature of artificial objects | Objects that no longer serve a useful function |
| Examples of artificial objects | Paint flecks, metal, inoperative spacecraft, fuel or gas tanks, etc. |
| Consequences of space pollution | Light pollution, hazardous levels of alumina in the upper atmosphere, etc. |
| Space junk removal methods | Using a harpoon, catching with a net, magnets, firing lasers, etc. |
| Number of tracked pieces of debris as of August 2021 | 29,210 |
| Amount of debris in orbit as of 2020 | 8,000 metric tons |
| Percentage of pollution in LEO | 85% |
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What You'll Learn
Space junk from rocket launches
Since the first rocket launch in 1957, humans have launched thousands of projectiles into space, and all of this space junk is the result of us launching objects from Earth. As of 2020, there were 8,000 metric tons of debris in orbit, and this figure is expected to increase.
The problem of space junk from rocket launches is exacerbated by the fact that there is currently no easy or cheap way to remove it. While there have been various methods proposed for removing large satellites, such as using a harpoon, net, robotic arms, magnets, or lasers, there is no efficient way to pick up smaller pieces of debris.
The most straightforward solution to the problem of space junk from rocket launches is to ensure that no more objects are left in orbit once they are no longer useful. However, this can be difficult and expensive, especially if the satellite or rocket was not designed for disposal. International guidelines exist for the disposal of old satellites and rockets, but there is no comprehensive legal regime or cost assignment structure in place to reduce space debris.
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Lack of regulation and enforcement
The issue of space pollution has become a matter of international urgency, with satellites worth billions of dollars under constant threat of collision with space debris. The accumulation of space junk poses a significant risk to climate and the environment, including light pollution that could hinder future scientific discoveries. Despite the development and implementation of various technical approaches to mitigate the growth of space debris, the lack of comprehensive legal frameworks and enforcement mechanisms remains a critical challenge.
The absence of stringent regulations and enforcement has resulted in a "wild west" scenario, where the rapid growth of satellite mega-constellations threatens to throttle competition and innovation. There are currently no meaningful penalties to deter rule-breaking, and the cost of cleaning up space debris falls on all users of space technology rather than the entities producing it. This lack of accountability has led to a lack of incentive for companies to proactively reduce space debris, as demonstrated by the introduction of mega-constellations, which will further contribute to the problem.
The United Nations has attempted to address this issue by requesting that companies remove their satellites from orbit within 25 years of their mission's end. However, this guideline is challenging to enforce, as satellite failures are common. To tackle this problem, several companies have proposed innovative solutions, such as removing dead satellites using robotic claws, nets, magnets, or lasers. While these solutions show promise, they primarily target large satellites, and there remains a lack of effective methods for removing smaller pieces of debris, such as paint flecks and metal fragments.
The responsibility for ensuring space sustainability lies with space industry leaders, regulators, and governments. The ITU, the United Nations agency for information and communications, should be empowered with the mandate and resources to address issues of space sustainability and prevent a future crisis. Additionally, economic incentives, such as an annual fee for each satellite put into orbit, could discourage the unnecessary accumulation of space junk. By learning from the lessons of the climate crisis, we can prioritize prevention and work towards a long-term sustainable solution for space pollution.
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Collisions between satellites
Satellite collisions can result in the creation of thousands of new pieces of debris, known as fragmentation events. These fragments can vary in size, ranging from micrometre-sized paint flakes to larger pieces of satellite components. The majority of these collisions occur in low Earth orbit (LEO), where the density of satellites is much higher compared to other orbits. The average impact speed of collisions in LEO is approximately 10 km/s, with some collisions reaching speeds above 14 km/s.
One notable example of a satellite collision occurred on February 10, 2009, between Iridium 33, a privately owned American communication satellite, and Kosmos 2251, a Russian military satellite. This collision took place at an altitude of 776 km above Siberia, with the satellites colliding at a speed of 11.7 km/s. The event generated over 2,000 large debris fragments that crossed multiple orbits, significantly increasing the risk of further collisions.
The consequences of satellite collisions can be far-reaching. These collisions contribute to the growing problem of space debris, which includes both inactive satellites and smaller fragments. The increase in debris can lead to a cascade effect, as described by the Kessler syndrome, where the density of objects in LEO becomes so high that collisions between them lead to an exponential increase in space debris over time. This phenomenon poses a significant threat to satellites, space missions, and even the International Space Station, potentially rendering certain orbital regions unusable.
To mitigate the impact of satellite collisions and reduce the generation of space debris, several measures have been proposed and implemented. NASA's Orbital Debris Program, founded in 1979, focuses on researching and implementing mitigation measures for space debris in Earth orbit. Additionally, techniques such as passivation of spacecraft at the end of their useful life and the use of reignitable upper stages to decelerate and deorbit them have been employed. However, despite these efforts, the problem of space debris and satellite collisions persists, emphasizing the need for continued vigilance and innovative solutions.
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The cost of removing debris
Since the first launch in 1957, humanity has sent thousands of objects into space, and all of this space junk continues to orbit the Earth. The cost of removing this debris is significant, and there are currently no active measures for the removal of nonfunctional satellites or spent rocket stages from Earth orbit. However, it is crucial to identify and evaluate potential approaches for orbital decluttering to ensure our future in space.
The cost of removing space debris varies depending on the method used and the size of the debris. Some of the methods currently under consideration include retrieval with an OMV (Orbital Maneuvering Vehicle), forcible deorbiting via attached propulsive devices, and deorbiting via passive drag-augmentation devices. The estimated costs for these methods range from $5.5 million to $20 million per object, with OMV removal being the least economically feasible option.
Another set of methods for removing space debris includes ground-based laser removal, water jet cutting, and net capture. Laser removal is suitable for medium-sized debris with a diameter of less than 10 cm, while water jet cutting is suitable for larger debris with a diameter between 10 cm and 1400 cm. Net capture is designed for super-large-sized debris with a diameter greater than 1400 cm. The cost of operating laser removal devices is estimated to be around $87.89 million per year, while the cost of a water jet spaceship is estimated at around $300 million per year.
The high cost of removing space debris is a significant challenge, and it is important to note that these costs are in addition to the expenses incurred in protecting satellites from debris. Satellite operators already bear substantial costs for design measures, surveillance, tracking, and moving operational satellites out of harm's way. As the amount of space debris continues to grow, the risks and costs associated with its removal will also increase, particularly if certain orbits become unusable for human activities.
In conclusion, the cost of removing space debris is substantial, and it is a complex issue that requires careful consideration and evaluation of various factors. The methods for removal are expensive, and the responsibility for bearing these costs falls on all users of space technology and knowledge. Finding solutions to reduce and remove space debris is crucial to ensuring the continued human and technological presence in space.
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Environmental impact on Earth
Since the first launch in 1957, humans have been launching thousands of projectiles into space, and everything that has been sent up, except astronauts, is still there. As of 2020, there were 8,000 metric tons of debris in orbit, with 85% pollution in low Earth orbit (LEO). This debris includes paint flecks from functioning space stations and inoperative spacecraft. While most debris burns up in the atmosphere, larger debris objects can reach the Earth's surface intact. According to NASA, an average of one piece of debris has fallen back to Earth each day for the past 50 years.
The accumulation of space junk poses a threat to humankind's future in space exploration, as well as detrimental effects on Earth's environment. Firstly, there is a risk of collision with and damage to functioning satellites, which could result in a chain reaction of collisions and the creation of more space junk. This could eventually make Earth's orbit unusable. Secondly, the introduction of mega-constellations of satellites into LEO could deposit hazardous levels of alumina into the upper atmosphere, causing pernicious solar radiation and climate issues.
Several methods have been proposed to address the issue of space junk, including the removal of large pieces of debris with instruments such as harpoons, lasers, and nets, as well as the development of self-removing satellites. However, there is a lack of comprehensive legal or cost assignment structures in place to reduce space debris. The United Nations has asked that all companies remove their satellites from orbit within 25 years after the end of their mission, but this is difficult to enforce due to satellite failures.
While space pollution may seem like a distant problem, it is important to recognize that it is a result of human activity on Earth and has potential environmental consequences for our planet. Just as we have polluted our oceans and rivers, we have now polluted space with our carelessness. It is crucial that we address this issue and take responsibility for our actions beyond our planet.
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Frequently asked questions
Space pollution is the accumulation of space junk or debris in orbit around the Earth. This includes anything from paint flecks to inoperative spacecraft.
We pollute space by launching objects from Earth that remain in orbit until they re-enter the atmosphere. Since the first launch in 1957, thousands of projectiles have been sent into space, and everything except astronauts who have returned is still there.
Space pollution has several consequences, including light pollution, which can hinder scientific discovery. It also poses a risk to climate and the environment, with the potential to deposit hazardous levels of alumina into the upper atmosphere. Additionally, the rapid growth of satellite mega-constellations can throttle competition and innovation if one country or company dominates a particular orbit.
Several technical approaches have been proposed to mitigate the growth of space debris, such as passivating spacecraft at the end of their useful lives and using upper stages that can reignite to decelerate and deorbit. The United Nations has also asked that companies remove their satellites from orbit within 25 years after their mission ends. However, this is challenging to enforce due to satellite failures.
