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UPSC MainsGeneral Studies Paper IIIScience and TechnologyPractice question

Space Debris Challenges and Redressal Mechanisms

What is space debris? What are its challenges and redressal? How did it affect China's spacecraft recently?

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Begin by defining space debris and citing relevant figures regarding orbital objects. Discuss the critical challenges posed by debris, such as the Kessler syndrome and hypervelocity impacts, followed by recent debris-related impacts on Chinese spacecraft (Tiangong station and Shenzhou missions). Conclude by detailing international and domestic redressal mechanisms, highlighting India's proactive initiatives.

Model answer

479 words

Introduction

Space debris comprises non-functional, human-made artificial objects orbiting Earth, including defunct satellites, spent rocket upper stages, mission-related fragments, and paint flecks. According to the European Space Agency (ESA) Space Environment Report, more than 46,500 orbital objects are actively tracked, with their cumulative mass exceeding 17,000 tonnes.

Core Challenges Posed by Space Debris

  • Kessler Syndrome: A theoretical scenario where the density of objects in Low Earth Orbit (LEO) becomes high enough that collisions trigger a cascading chain reaction, multiplying debris and rendering critical orbital corridors impassable.
  • Hypervelocity Impacts: Orbital debris travels at relative speeds reaching up to 15 km/s (approx. 54,000 km/h). Even sub-centimeter particles possess sufficient kinetic energy to cause catastrophic structural penetrations on manned and unmanned spacecraft.
  • Operational and Economic Burden: Active satellites must frequently perform collision avoidance maneuvers (CAMs), consuming valuable onboard propellant and significantly shortening mission operational lifespans.

Recent Impact on China's Space Program

Orbital debris has caused critical operational disruptions to China's orbital infrastructure rather than outright catastrophic destruction:

  • Shenzhou Return Capsule Damage: Space debris struck and cracked the return capsule's viewport window while docked at the Tiangong Space Station. Because structural integrity was compromised, the capsule was deemed unfit for atmospheric re-entry, necessitating alternative evacuation arrangements for the crew.
  • Tiangong Solar Wing Damage: Crew members aboard the Shenzhou-17 and Shenzhou-18 missions conducted emergency extravehicular activities (spacewalks) to repair the Tiangong space station's core solar arrays after micro-debris punctured external power lines, causing power supply degradation.

Redressal Mechanisms and Frameworks

  • Space Situational Awareness (SSA): Continuous tracking through ground and space-based sensor arrays. For instance, China initiated the AI-enabled Gande Constellation to enhance multi-orbital tracking.
  • International Mitigation Guidelines: Adoption of standards established by the Inter-Agency Space Debris Coordination Committee (IADC) and the United Nations Committee on the Peaceful Uses of Outer Space (UNCOPUOS), including the mandate to de-orbit LEO satellites within 5 to 25 years post-mission.
  • Graveyard Orbits: Re-orbiting spent geostationary satellites to designated disposal orbits located more than 300 km above Geostationary Earth Orbit (GEO).
  • Active Debris Removal (ADR): Engineering solutions employing robotic capture arms, tether nets, electrodynamic tethers, or harpoons to de-orbit defunct high-mass space hardware.

Indian Context and Initiatives

India maintains a comparatively small debris footprint and has developed proactive management systems:

  • Project NETRA & IS4OM: ISRO’s dedicated Space Situational Awareness network, operating high-precision optical radars and telescopes to monitor assets and assess collision risks.
  • Debris Free Space Missions (DFSM) 2030: ISRO's commitment to ensure that all future governmental and commercial space missions achieve zero space debris generation by 2030.
  • SpaDeX Mission: The Space Docking Experiment designed to demonstrate autonomous rendezvous, docking, and manipulation techniques foundational for future domestic ADR missions.

Conclusion

Ensuring the long-term sustainability of the orbital environment requires transitioning from voluntary guidelines to legally binding multilateral frameworks on space traffic management. Initiatives like India's Debris Free Space Mission (DFSM) 2030 provide a model pathway toward sustainable and safe outer space operations.

Key facts to remember

definition
Kessler Syndrome

A proposed cascade effect in which collision between orbital objects generates fragments, which in turn collide with other satellites, rendering Low Earth Orbit hazardous and unusable.

statistic

Over 46,500 artificial objects are actively tracked in orbit, with a combined orbital mass exceeding 17,000 tonnes.

— ESA Space Environment Report
example
Shenzhou Viewport Incident

Orbital micro-debris cracked the docked return capsule viewport window at China's Tiangong station, rendering it unfit for safe atmospheric re-entry.

scheme
Debris Free Space Missions (DFSM) 2030

An initiative launched by ISRO aiming for all Indian space missions—governmental and private—to achieve zero orbital debris creation by the year 2030.

Frequently asked questions

What is a Graveyard Orbit?

A graveyard orbit is a disposal orbit situated roughly 300 kilometers above geostationary orbit (GEO), where non-operational spacecraft are moved to prevent collisions with active satellites.

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