Sagittarius A* (Sgr A*)
Why in News: Scientists have recently identified another intermediate-mass black hole located at the center of a star cluster within the Milky Way, near the supermassive black hole known as Sagittarius A* (SgrA*).
About Sagittarius A* (Sgr A*)
- Nature: Supermassive black hole at the center of the Milky Way.
- Activity: Mostly dormant, occasionally absorbs gas or dust.
- Mass: Estimated to be 4.3 million times that of the sun.
- Location: Constellation Sagittarius.
- Size: Diameter of about 14.6 million miles (23.5 million kilometers).
- Radio Waves: Strong source; emissions primarily from a synchrotron mechanism, indicating free electrons and magnetic fields.
- Event Horizon: Radius of 12 million km (7 million miles).
What is a Black Hole?
- Definition: A region in space with gravity so strong that even light cannot escape.
- Formation: Occurs when matter is compressed into a tiny space, often when a star is dying.
- Detection: Difficult due to the absence of light.
- Types: The largest are called “supermassive black holes,” with masses exceeding 1 million suns.
- Prediction: First predicted by Albert Einstein in 1916 with his general theory of relativity.
What is the Event Horizon of a Black Hole?
- Definition: The boundary around a black hole from which nothing can escape.
- Escape Velocity: Within the event horizon, it exceeds the speed of light.
- Schwarzschild Radius: The radius of the event horizon, named after German astronomer Karl Schwarzschild.
Remission of Duties and Taxes on Exported Products (RoDTEP) Scheme
Why in News: The tea industry has requested increased rates under the RoDTEP scheme to enhance the competitiveness of exports in international markets.
About RoDTEP Scheme:
Overview:
- The RoDTEP (Remission of Duties and Taxes on Exported Products) Scheme is a key export promotion initiative by the Union Ministry of Commerce and Industry.
- It aims to refund embedded central, state, and local duties and taxes on export inputs that have not been refunded or rebated previously.
Background:
- Launched in September 2019 to boost domestic exports and replace the Merchandise Exports from India (MEIS) scheme.
- Introduced following a WTO ruling that deemed the MEIS scheme non-compliant due to its provision of export subsidies on various goods.
- The scheme was extended to all goods from January 1, 2021, as per a notification by the Directorate General of Foreign Trade (DGFT).
Objectives:
- Enhance the competitiveness of export sectors.
- Create employment opportunities.
- Contribute to overall economic growth, aligning with the vision of an Aatmanirbhar Bharat.
Features:
- Eligibility: Open to both manufacturers and merchant exporters without any turnover threshold. Goods must be directly exported by the claimant.
- Scope: Covers physical exports and outbound shipments of services from India, allowing service providers to claim refunds on hidden levies.
- Rebate Calculation: Claimed as a percentage of the Freight On Board value of exports.
- Implementation: Managed by Customs through a simplified IT system.
- Rebates: Issued as transferable duty credits or electronic scrips (e-scrips), maintained in an electronic ledger by the Central Board of Indirect Taxes and Customs (CBIC).
- Exclusions: Rebates not available for duties and taxes already exempted, credited, or remitted. Specific export products may have value caps per unit. Excludes export goods subject to minimum export price, restricted/prohibited items, deemed exports, and goods manufactured by domestic tariff area units supplied to SEZs or exported by units in SEZs.
National Clean Air Programme
Why in News: A recent study by the Centre for Science and Environment (CSE) revealed that efforts to mitigate road dust, aimed at reducing PM10 pollution, are consuming a significant portion — 64% — of the funds allocated under the National Clean Air Programme (NCAP).
About National Clean Air Programme
Launch and Purpose
- Launched in January 2019 by the Ministry of Environment, Forest, and Climate Change.
- A long-term, time-bound, national-level strategy to comprehensively address air pollution across the country.
Objectives
- Strictly enforce measures to prevent, control, and reduce air pollution.
- Strengthen the air quality monitoring network nationwide.
- Increase public awareness and enhance capacity-building measures.
Target
- Aim to reduce PM10 concentration by 20-30% from the 2017 baseline by 2024.
- Revised target: reduce PM10 levels up to 40% or achieve national standards (60 µg/m3) by 2025-26.
Implementation
- The Central Pollution Control Board (CPCB) will execute the program in accordance with the Air (Prevention and Control of Pollution) Act, 1981.
- 131 non-attainment cities identified for program implementation.
- City-specific action plans include measures to strengthen monitoring networks, reduce vehicular and industrial emissions, and raise public awareness.
- Implementation monitored by Central and State Committees: Steering Committee, Monitoring Committee, and Implementation Committee.
- State Pollution Control Boards regularly monitor and publish city air quality findings.
Flower Flies
Why in News: Researchers at the Shadpada Entomology Research Lab (SERL) of Christ College, Irinjalakuda, have identified two species of flower flies in Kerala for the first time.
About Flower Flies
- Species Discovered: Mesembrius bengalensis and Mesembrius quadrivittatus have been identified in the Kole wetlands and Vilagan Kunnu hillocks of Thrissur district.
- Family and Order: Flower flies belong to the family Syrphidae and order Diptera.
- Common Name: They are often referred to as flower flies due to their frequent visits to flowers, similar to bees and wasps.
- Mimicry: These flies have evolved to mimic bees or wasps to evade predators.
Ecological Role
- Pollinators: Flower flies are significant pollinators.
- Larvae: The larvae are excellent biological control agents and contribute to nutrient recycling.
Key Facts about Kole Wetlands
- Location: The largest brackish, humid tropical wetland ecosystem in Kerala.
- Geographic Extent: Extends from the northern bank of Chalakudy River in the south to the southern bank of Bharathapuzha River in the north.
- Migratory Birds: Situated in the central Asian Flyway of migratory birds.