Space Debris and its Impact on Space Exploration
A lot has changed since the launch of Sputnik in 1957, and space exploration is now an industry in which participants from all over the world have a vested interest. Whether the area for discussion is low Earth orbit (LEO) or beyond to new planets and moons, space is now a place where many missions are routinely being conducted. One problem, however, is that alongside the increase of space travel is the increase of space debrisi.e., the junk that is jettisoned or left behind or old technology that is simply just hanging out in space no longer serving any meaningful function. Space debris consists of defunct satellites, spent rocket stages, fragments from collisions, and other remnants of human endeavors in space. Space debris represents a serious problem because it can affect future space operations and explorations and even clog up the skies making it harder for researchers to probe the reaches of the universe with their telescopes. In short, space junk is turning the skies into a kind of highway full of litter that no one is bothering to collect and remove, and soon the highway will be impassible. This paper examines the problem of space debris, its sources, the risks it presents, and what measures can be taken to reduce its impact.
Nature and Sources of Space Debris
Space debris can be categorized based on where it comes from and its size. It can range from large objects, such as inactive satellites and spent rocket stages, to smaller fragments that have been created by collisions and explosions. According to the European Space Agency (ESA), there are approximately 34,000 debris objects larger than 10 cm, 900,000 objects between 1 and 10 cm, and an estimated 128 million objects smaller than 1 cm orbiting Earth (ESA, 2023).
The main sources of space debris include satellites that have reached the end of their operational lives but remain in orbit; upper stages of rockets that have completed their mission and remain in space; collisions between space objects that create numerous fragments, and more.
For example, the ESAs Envisat is an Earth observation satellite that launched in 2002 but that stopped operations in 2012. Envisat weighs over eight tons and is 26 meters longand it is one of the largest defunct satellites in earths orbit, at an altitude of approximately 785 km. The fact that it is there represents a collision risk to other space objects (ESA, 2023). There has been some discussion about its removal (capturing and deorbiting it), but doing so would require substantial heft (Estable et al., 2020).
Rocket stages that have completed their missions also contribute to space debris. One example is the core stage of the Long March 5B rocket, launched by China in May 2020. Weighing around 20 tons (100 feet long and 16 feet wide), this rocket stage re-entered Earth's atmosphere in an uncontrolled manner, which raised international concern due to the potential risk of debris falling in populated areas like New York City (Leman, 2020). Fortunately, most of the debris fell into the Atlantic Ocean. Nonetheless, incidents like these show the risks and challenges that large, uncontrolled rocket stages remaining in orbit represent for people below.
Collisions between space objects represent...
…features like autonomous collision avoidance systems and end-of-life disposal plans. This shows that recommended best practices and collaboration among operators are being implemented to help address the space debris issue.On-orbit servicing technologies like satellite refueling, repair, propulsion, and relocation, can extend the operational lives of satellites and reduce the number of defunct satellites that end up in orbit. Companies like Northrop Grumman's Space Logistics and Astroscale are developing capabilities to offer these services, so as to improve the sustainability of space operations (Rudico et al., 2024). Likewise, advancements in debris mitigation technologies like improved shielding materials and more efficient propulsion systems for maneuvering, as well as new active debris removal concepts can all be of important use. All of this can also be supported by strengthening international policies and regulations to promote responsible behavior in space activities by making it so that going forward companies must meet best practice thresholds and standards. There will need to be the establishment of binding agreements and the enforcement of existing guidelines to secure compliance and enforce accountability among space-going nations and private entities.
Conclusion
Space debris continues represent a serious risk for the future of space exploration and satellite operations. The increasing population of debris objects in orbit also threatens the safety and sustainability of space activities. That is why it is important to address this issue; however, doing so means that immediate consideration must be given to adopting new technologies, bolstering international cooperation, and implementing policies to promote standards and enforce adherence. Through the application of risk-reduction strategies and implementing debris-reducing operations, it may be possible to reverse course before it is too late.…
References
David, L. (2021). China's Anti-Satellite Test: Worrisome Debris Cloud Circles Earth. Retrieved from https://www.space.com/3415-china-anti-satellite-test-worrisome-debris-cloud-circles-earth.html
ESA. (2023). Space Environment Report 2023. Retrieved from https://www.esa.int/Space_Safety/ESA_s_Space_Environment_Report_2023
ESA. (2024). Clear Space 1. Retrieved from https://www.esa.int/Space_Safety/ClearSpace-1
Estable, S., Pruvost, C., Ferreira, E., Telaar, J., Fruhnert, M., Imhof, C., ... & Wolahan, A.
(2020). Capturing and deorbiting Envisat with an Airbus Spacetug. Results from the ESA e. Deorbit consolidation phase study. Journal of Space Safety Engineering, 7(1), 52-66.
Leman, J. (2020). Chunks of China's Powerful Rocket Fall Back to Earth, Narrowly MissingNYC. Retrieved from https://www.popularmechanics.com/space/a32451633/china-long-march-5b-rocket-debris/
NASA. (2009). The Collision of Iridium 33 and Cosmos 2251: The Shape of Things to ComeRetrieved from 18971.pdf (nasa.gov) Rudico, J., Nichols, J. T., & Rogers, G. (2024). Potential United States Space Force Mission LifeExtension Applications. In AIAA SCITECH 2024 Forum (p. 1067).
Wall, M. (2022). Kessler Syndrome and the space debris problem. Retrieved from https://www.space.com/kessler-syndrome-space-debris
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