Space Pollution

Syllabus: Space and Technology

Source: TH

Context: The rapid expansion of space activities has led to significant environmental challenges, including emissions from rocket launches and the growing issue of orbital debris.

Present Space Pollution Data and Trends:

• Orbital Debris: Over 13,230 satellites remain in orbit, with 10,200 still operational.

• Fragmentation Events: Around 650+ collisions and break-ups have created over 36,860 trackable objects.

• Mass in Orbit: The total mass of space objects exceeds 13,000 tonnes, significantly raising collision risks.

• Growth Rate: Increasing satellite launches by private and public entities exacerbate overcrowding in Low Earth Orbit (LEO).

Major Sources of Space Pollution:

• Defunct Satellites: Non-operational satellites remain in orbit, contributing to debris.

• Rocket Stages: Spent stages left in orbit after launches.

• Fragmentation Debris: Pieces from satellite collisions and explosions.

• Satellite Burnup Ash: Metallic residues released during atmospheric re-entry.

Rockets Impact Pollution:

• Emission Composition: Rocket launches release carbon dioxide, black carbon, and water vapor.

• Black Carbon Effects: Absorbs sunlight 500 times more efficiently than CO₂, amplifying warming.

• Ozone Depletion: Chlorine-based propellants disrupt the ozone layer.

• Energy Intensity: Rocket manufacturing consumes large amounts of energy and resources.

Major Initiatives to Counter Space Debris:

1. 1.Kessler Syndrome Mitigation (NASA): Studies and strategies to avoid cascading collisions in orbit by limiting debris generation.

1. 1.European Space Agency’s (ESA) ClearSpace-1: A robotic mission to remove a single large piece of debris from orbit by 2025.

1. 1.Japan’s ELSA-d Mission: A demonstration by Astroscale for capturing and de-orbiting defunct satellites using magnetic capture technology.

1. 1.United Nations’ Guidelines for Long-Term Sustainability of Outer Space Activities: Non-binding recommendations for safe satellite operations, debris mitigation, and international cooperation.

1. 1.Active Debris Removal (ADR) Projects: Development of technologies like nets, harpoons, and lasers to capture or de-orbit debris (e.g., ESA and JAXA).

Dangers of Outer Space Pollution:

• Collision Risks: High-velocity debris can destroy operational satellites, disrupting communication and navigation.

• Climate Monitoring Disruption: Space junk interferes with data collection for weather prediction and disaster management.

• Human Spaceflight Hazards: Threatens missions like those on the International Space Station (ISS).

• Cost Escalation: Avoiding debris through shielding or orbital adjustments increases mission expenses.

Barriers to Space Sustainability:

• Lack of Regulation: No binding international laws govern emissions or debris management.

• Commercial Resistance: Companies prioritize cost-efficiency over sustainable practices.

• Data Sharing Issues: Security and proprietary concerns hinder the creation of a unified debris tracking system.

• Outer Space Treaty Gaps: Absence of enforceable provisions for environmental safeguards.

Way Ahead:

• Regulatory Frameworks: Establish binding agreements through The Committee on the Peaceful Uses of Outer Space (COPUOS) for emissions, debris mitigation, and data-sharing.

• Green Technology Investment: Prioritize reusable rockets, biodegradable satellites, and cleaner fuels.

• Debris Management: Develop Autonomous Debris Removal (ADR) systems and incentivize their adoption.

• Global Collaboration: Foster international cooperation for equitable space access and environmental protection.

• Sustainable Practices: Encourage private actors through financial incentives and penalties for eco-friendly approaches.

Conclusion:

Space exploration must balance technological advancement with environmental responsibility. By implementing stringent regulations, fostering innovation, and encouraging global collaboration, humanity can secure a sustainable future for both the earth and outer space.

Insta Links:

• Space-debris

• International civil aviation laws provide all countries complete and exclusive sovereignty over the airspace above their territory. What do you understand by ‘airspace’? What are the implications of these laws on the space above this airspace? Discuss the challenges which this pose and suggest ways to contain the threat. (UPSC-2014)