Context:
NASA’s Van Allen Probe A, a ~600 kg satellite, is re-entering Earth’s atmosphere after mission completion, raising concerns about space debris and safety risks.
Key Highlights:
- Mission Overview
- Launched on August 30, 2012, along with Probe B.
- First mission to study Earth’s radiation belts using twin spacecraft.
- Operated for nearly 7 years (2012–2019).
- Scientific Contributions
- Studied Van Allen Radiation Belts (charged particles trapped by Earth’s magnetic field).
- Provided insights into particle dynamics, solar storms, and space weather.
- Helped understand protection against cosmic radiation and solar wind.
- Reason for Re-Entry
- Mission ended due to fuel exhaustion, making orientation impossible.
- Gradual orbital decay leading to atmospheric re-entry.
- Safety Concerns
- Most satellite components burn up due to atmospheric friction.
- Minimal risk to humans, though small debris may survive.
- Space Debris Issue
- Highlights growing concerns over orbital congestion and debris management.
Relevant Prelims Points:
- Van Allen Radiation Belts:
- Two layers of charged particles around Earth.
- Protect Earth from harmful solar and cosmic radiation.
- NASA Van Allen Probes Mission:
- Twin spacecraft for simultaneous measurement.
- Improved understanding of space weather phenomena.
- Space Debris:
- Includes defunct satellites, fragments, and mission-related debris.
- Can threaten operational satellites and space missions.
- Atmospheric Re-entry:
- Process where objects burn due to friction in Earth’s atmosphere.
Relevant Mains Points:
- Importance of Space Weather Research
- Helps protect satellites, communication systems, and astronauts.
- Critical for navigation, defence, and disaster management systems.
- Rising Space Debris Challenge
- Increasing satellite launches (commercial + military) → orbital crowding.
- Risk of Kessler Syndrome (chain collision effect).
- Governance & Regulatory Gaps
- Lack of binding global framework for debris mitigation.
- Need for international cooperation (UN COPUOS guidelines).
- India’s Perspective
- ISRO must ensure responsible space operations.
- Develop debris tracking and mitigation technologies.
- Way Forward
- Promote active debris removal technologies.
- Enforce end-of-life deorbiting norms.
- Strengthen global space governance frameworks.
- Encourage sustainable space practices.
UPSC Relevance:
- GS Paper 3: Space technology, space debris, science advancements.
- Prelims: Space missions, Earth’s radiation belts.