Greta Jimenez
Space pollution, or space debris, is a growing problem. There are currently millions of tiny objects in low Earth orbit (LEO), with more objects being placed into orbit now than ever before. These objects, which include spent rocket boosters, active satellites, and dead satellites, pose a risk to current and future spacecraft. The risk of collision is increasing, and even a small object can cause significant damage. To prevent this, collision avoidance strategies are becoming more important, and satellite health monitoring must improve. There are also technological efforts to limit debris, such as making reusable rockets and maneuverable satellites, and debris-cleaning tech like ground lasers. Orbital-use fees have also been proposed as a way to reduce the number of satellites in orbit.
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What You'll Learn
Remove small debris and nudge large debris to prevent collisions
The removal of small debris and the nudging of large debris to prevent collisions are crucial strategies in mitigating space pollution. With potentially 170 million pieces of debris in orbit, the risk of collisions between satellites and existing debris is a growing concern.
Small Debris Removal
Small debris removal is essential despite the challenges of tracking and detecting these objects due to their size. Even a small object, such as a nickel or a ping pong ball, can cause significant damage or shatter existing infrastructure, creating even more fragments. NASA is actively seeking solutions for detecting, tracking, and remediating small space debris, with a focus on practical and cost-effective strategies. Current approaches include designing satellites for controlled deorbiting and implementing active debris removal missions, but these can be costly and time-consuming. An ideal solution would reduce the overall debris population, mitigate collision risks, and maintain the sustainability of orbital space.
Large Debris Nudging
Nudging large debris to prevent collisions is a more cost-effective strategy than removal, as it can still meaningfully prevent collisions without the need for direct attachment and movement of the debris. Large debris, such as defunct satellites, can be physically removed using space tugs that attach and deorbit the objects. However, there are challenges with removing large debris, including explosion risks if there is propellant onboard, property rights issues, and the difficulty of controlling small but dangerous objects.
Collision Avoidance
Collision avoidance manoeuvres are becoming a regular part of flying missions in low-Earth orbit. Satellites can be manoeuvred out of the way of potential collisions, but this requires advanced planning and extra fuel. Improved collision avoidance strategies are necessary as the risk of collisions increases with more objects being placed into orbit.
Mitigation Strategies
To mitigate space debris generation, the ESA has implemented stricter requirements for its missions, aiming to reduce the amount of additional debris left in orbit. These guidelines include ensuring the safe disposal of space objects through atmospheric reentry or reorbiting to a safe altitude. Additionally, missions should include interfaces that facilitate removal from orbit if self-disposal fails. By reducing the time an object spends in orbit, the chances of collisions and further debris creation are decreased.
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Implement orbital-use fees for satellite operators
The space industry is rapidly growing, with more objects being placed into orbit now than ever before. This has resulted in a buildup of space debris, which poses a costly collision risk to satellite operators. This is known as Kessler Syndrome, where a critical threshold of orbiting debris triggers a positive feedback loop of debris collisions, rendering orbits unusable.
One proposed solution to this problem is the implementation of orbital-use fees (OUFs) for satellite operators. OUFs are internationally agreed-upon fees for putting satellites into orbit. They are designed to address the incentive problem, where satellite operators do not account for the costs they impose on each other via collision risk. By charging operators for the cost of the collision risk they impose, OUFs can correct these incentives and increase the value of the space industry.
The fee for each satellite would be calculated based on the cost to the industry of putting another satellite into orbit, including the projected current and future costs of additional collision risk and space debris production. These fees would increase over time as the value of cleaner orbits rises. In one model, the optimal fee was found to rise at a rate of 14% per year, reaching approximately $235,000 per satellite-year by 2040.
OUFs would also provide an incentive for satellite operators to deorbit their satellites when necessary, reducing the risk of collisions and the buildup of space debris. This is in contrast to launch fees, which do not provide an incentive for operators to remove their satellites from orbit.
Overall, the implementation of orbital-use fees for satellite operators is a potential solution to the space junk problem, as it addresses the underlying incentive problem and increases the long-run value of the space industry.
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Improve collision-avoidance strategies
Collision avoidance is a critical strategy to mitigate the growing problem of space debris. With the dramatic rise of space activity, the number of objects in orbit is increasing, heightening the risk of collisions. The majority of the risk to operational spacecraft comes from untrackable objects smaller than 5–10 cm, which can cause significant damage due to their high speed.
To improve collision-avoidance strategies, several measures can be implemented:
- Enhanced Satellite Health Monitoring and Passivation Techniques: Satellites should be equipped with robust passivation techniques to prevent breakups from within. Additionally, satellite health monitoring systems should be improved to detect any potential issues that may lead to unexpected breakups or malfunctions.
- Minimise Intentional Release of Objects: The intentional release of objects such as protective covers, lens caps, and rocket fairings should be minimised. These objects can become space debris and increase the risk of collisions.
- Space Traffic Management: Analogous to air traffic management, the implementation of Space Traffic Management protocols can help coordinate space activities and improve collision avoidance. This includes the development of new communication protocols and space traffic coordination systems.
- Improved Tracking Technologies: Advancements in tracking technologies are crucial to better monitor and avoid space debris. The Space Fence system, for instance, aims to improve the capabilities of the U.S. Air Force Space Surveillance Network by tracking objects as small as 2–5 cm.
- Automation and Artificial Intelligence (AI): Automation and AI play a vital role in collision avoidance. AI-powered systems can optimise routes, perform dynamic line planning, and enhance collision avoidance capabilities for autonomous and uncrewed platforms.
- Orbital-Use Fees: Implementing fees for satellite operators to launch satellites into orbit can help reduce the number of satellites and, consequently, decrease the risk of collisions. These fees would reflect the cost imposed on the industry by each additional satellite, including the increased collision risk and space debris production.
- Debris-Cleaning Technologies: Industries have developed various debris-cleaning technologies, such as ground laser nudges, space tugs, and space lasers, to remove small debris and prevent collisions.
By implementing these improved collision-avoidance strategies, we can effectively reduce the risk of collisions and mitigate the impact of space debris on operational spacecraft and the space industry as a whole.
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Develop debris-cleaning technology
The development of debris-cleaning technology is crucial to addressing the growing issue of space pollution. With an increasing number of objects being placed into orbit, the risk of collisions between satellites and existing debris is also rising. This has led to the emergence of various debris-cleaning technologies, such as ground laser nudges, space tugs, and space lasers.
Ground laser nudges involve using lasers to gently push or "nudge" small pieces of debris, altering their trajectory and preventing collisions. Space tugs, on the other hand, are spacecraft designed to rendezvous with and capture larger pieces of space debris. By physically interacting with the debris, space tugs can de-orbit or relocate the captured objects, reducing the overall debris population in critical orbits.
Space lasers, while still in development, offer another promising solution. These lasers could be used to either vaporize smaller pieces of debris or to push larger objects out of orbit and into the atmosphere, where they would burn up during re-entry.
In addition to these technologies, researchers at the USC Viterbi School of Engineering's Information Sciences Institute (ISI) are working on a range of innovative solutions. These include sensor fusion to locate debris, novel robotic grippers, and the design of a spacecraft capable of hosting various capture technologies. The institute's Specific Rendezvous and Proximity Operations (RPO) technology has the potential for dual use in both Active Debris Remediation and the In-Space Assembly and Manufacturing (ISAM) market.
The development and deployment of these debris-cleaning technologies are crucial steps in mitigating the risks posed by space pollution, ensuring the safety of current and future space missions, and promoting the long-term sustainability of space exploration.
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Reduce the amount of refuse ejected from crewed missions
The amount of refuse ejected from crewed missions can be reduced by implementing several measures and strategies. Firstly, it is crucial to minimise the intentional release of objects such as protective covers, lens caps, and rocket fairings during crewed missions. These objects can contribute to the accumulation of space debris and increase the risk of collisions.
Another strategy is to improve satellite health monitoring and implement robust passivation techniques. By closely monitoring the health and functionality of satellites, operators can prevent unexpected breakups or failures that may result in the ejection of refuse. Passivation techniques, such as passivation heaters or coatings, can help prevent satellites from breaking up from within due to thermal or mechanical stresses.
Additionally, collision avoidance manoeuvres are essential to reducing refuse ejection. With the increasing number of objects in low-Earth orbit, the risk of collisions between satellites and space debris is also rising. By employing automated systems, improved communication protocols, and space traffic coordination, satellites can be manoeuvred out of the way of potential collisions, minimising the chances of refuse ejection.
Furthermore, implementing orbital-use fees or taxes on satellites can provide an economic incentive to reduce space debris. By charging operators a fee for each satellite placed into orbit, the costs associated with collision risks and space debris production can be factored into launch decisions. This can encourage operators to launch fewer satellites, reducing the amount of refuse ejected and lowering the overall congestion in low-Earth orbit.
Finally, the development and utilisation of reusable rockets and manoeuvrable satellites can also contribute to reducing refuse ejection. Reusable rockets can minimise the number of spent rocket boosters left in orbit, while manoeuvrable satellites can actively adjust their position to avoid collisions and the subsequent ejection of refuse.
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Frequently asked questions
There are several ways to prevent space pollution, including:
- Implementing an orbital-use fee, a tax on orbiting satellites, to reduce the number of satellites in orbit
- Using tethers instead of jettisoning lens caps and de-spin devices
- Reducing the amount of refuse ejected from crewed missions
- Moving the spacecraft into a disposal orbit after its functional lifetime
- Designing satellites for controlled deorbiting at the end of their mission
- Developing debris-cleaning technology like ground laser nudges, space tugs, and space lasers
Here are some methods to clean up existing space pollution:
- Removing small debris, which can cause significant damage due to their high speed
- Developing a more robust, scalable system to detect, track, and remediate small space debris
- Implementing active debris removal missions
Space pollution poses several risks, including:
- Increased chance of collisions between satellites and existing debris, which can cause catastrophic damage
- Congestion in Low Earth Orbit (LEO), the most accessible area of space
- Potential damage to current and future spacecraft
Some organizations that are actively addressing space pollution include:
- ESA (European Space Agency): They have implemented new Space Debris Mitigation guidelines and policies to reduce the amount of additional debris left in orbit.
- NASA: They are seeking solutions from innovators worldwide to detect, track, and remediate small space debris through competitions and challenges.
