Context:

Astronomers have reported observational evidence of a rare cosmic explosion called a superkilonova, based on analysis of an unusually bright and long-lasting astronomical event detected about 1.3 billion light-years away.

UPSC Relevance:

Science and Tech.

UPSC PYQ:

Q. Consider the following pairs : (2023)

How many of the above pairs are correctly matched?

(a) Only one
(b) Only two 
(c) All three 
(d) None

About Kilonova?

• A kilonova occurs when two neutron stars merge.
• This merger ejects material rich in heavy radioactive elements like:
  • Gold
  • Platinum
  • Neodymium
• These elements undergo radioactive decay, producing:
• Bright emission in optical and infrared wavelengths.
• Kilonovae are key sources of heavy elements in the universe (r-process nucleosynthesis).

What is a Superkilonova?

A superkilonova is a rarer, more energetic version of a kilonova.

Why “Double Whammy”?

• Because it involves two energy sources:
  • Produces a kilonova.
• Supernova explosion
  • A massive star explodes.
  • Leaves behind two neutron stars.
• Neutron star merger
  • The neutron stars spiral inward and merge.

About Neutron Star:

• Extremely dense and compact celestial objects formed from the collapse of a massive star’s core after it runs out of fuel.
  • During this collapse, protons and electrons are crushed together, forming neutrons.
  • If the collapsing core’s mass is between 1 and 3 solar masses, the newly-created neutrons can halt further collapse, resulting in a neutron star.
  • Cores with masses exceeding this range continue to collapse into stellar-mass black holes .

Context:

How China—especially Beijing—has sharply reduced air pollution over the past decade, drawing policy lessons for India, particularly Delhi-NCR, which continues to face severe air-quality crises.

Key Evidence Highlighted (China vs India)

China (Beijing)

• Achieved a ~50% reduction in annual PM2.5 levels between 2013 and 2021.
• Implemented:
  • Clean Air Action Plan
  • Blue Sky Protection Campaign
• Used:
  • Strict industrial emission norms
  • Closure/relocation of polluting industries
  • Massive push for electric mobility
  • Real-time air-quality monitoring
  • Heavy penalties and strong enforcement
• Followed a regional approach: Beijing–Tianjin–Hebei “airshed” coordination to control transboundary pollution.

India (Delhi-NCR)

• Has laws like:
  • Air (Prevention and Control of Pollution) Act, 1981
  • Environment (Protection) Act, 1986

• But faces:
  • Fragmented governance (Centre–State–Local overlap)
  • Weak enforcement and regulatory capacity
  • Over-reliance on short-term emergency measures (odd-even, construction bans)
• Bodies like CAQM exist but lack:
  • Strong enforcement powers
  • Adequate funding and accountability

What India Can Learn (Policy Lessons)

Shift from episodic response to mission-mode strategy

• Treat air pollution as a public health emergency, not a seasonal problem.

Strengthen institutional capacity

• Empower CAQM with:
  • Enforcement authority
  • Financial autonomy
  • Accountability mechanisms

Regional (airshed-based) governance

• Adopt a Beijing–Tianjin–Hebei–style model for Delhi-NCR and neighbouring states.

Transport-sector reforms

• Stronger vehicle emission standards (beyond BS-VI)
• Expansion of public transport and EVs
• Congestion pricing and better traffic management

Data-driven regulation

• Public access to air-quality and emissions data
• Real-time emissions monitoring
• Source-apportionment-based policymaking

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