{"id":7738,"date":"2026-01-27T16:22:19","date_gmt":"2026-01-27T16:22:19","guid":{"rendered":"https:\/\/mehnatt.com\/?p=7738"},"modified":"2026-01-27T16:22:19","modified_gmt":"2026-01-27T16:22:19","slug":"short-notes-on-current-affairs-18-01-2026","status":"publish","type":"post","link":"https:\/\/mehnatt.com\/?p=7738","title":{"rendered":"Short notes on Current Affairs 18.01.2026"},"content":{"rendered":"\n<h3 class=\"wp-block-heading has-text-align-center has-ast-global-color-6-background-color has-background\">INS Sagardhwani and Sagar Maitri-5 (SM-5)<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Vessel &amp; Mission:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\"><strong>INS Sagardhwani<\/strong>, India\u2019s oceanographic research vessel under NPOL (Naval Physical and Oceanographic Laboratory), DRDO, flagged off for 5th edition of Sagar Maitri (SM-5) on 17 January 2026 from Southern Naval Command, Kochi.<\/li>\n\n\n\n<li style=\"font-size:17px\">Flagging-off ceremony led by Shri Radha Mohan Singh, MP and Chairperson, Parliamentary Standing Committee on Defence, with DRDO &amp; Navy officials present.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"320\" height=\"214\" src=\"https:\/\/mehnatt.com\/wp-content\/uploads\/2026\/01\/sagardhwani1.jpg\" alt=\"\" class=\"wp-image-7740\" style=\"aspect-ratio:1.4954362906170136;width:401px;height:auto\" srcset=\"https:\/\/mehnatt.com\/wp-content\/uploads\/2026\/01\/sagardhwani1.jpg 320w, https:\/\/mehnatt.com\/wp-content\/uploads\/2026\/01\/sagardhwani1-300x201.jpg 300w\" sizes=\"auto, (max-width: 320px) 100vw, 320px\" \/><figcaption class=\"wp-element-caption\"><strong>INS Sagardhwani<\/strong>   Source: PIB<\/figcaption><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Purpose of Sagar Maitri:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Flagship collaborative initiative between Indian Navy and DRDO, promoting scientific cooperation and socio-economic collaboration among Indian Ocean Rim (IOR) countries.<\/li>\n\n\n\n<li style=\"font-size:17px\">Part of India\u2019s vision of <strong>MAHASAGAR<\/strong> (Mutual and Holistic Advancement for Security and Growth Across Regions).<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Scientific Component \u2013 MAITRI:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Stands for Marine &amp; Allied Interdisciplinary Training and Research Initiative.<\/li>\n\n\n\n<li style=\"font-size:17px\">Focuses on long-term collaboration in ocean research, capacity building, and professional exchanges among IOR nations.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Mission Details:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">SM-5 retraces historic routes of INS Kistna from the International Indian Ocean Expedition (1962\u201365).<\/li>\n\n\n\n<li style=\"font-size:17px\">Engages in collaborative oceanographic studies with eight IOR countries: <strong>Oman, Maldives, Sri Lanka, Thailand, Malaysia, Singapore, Indonesia, Myanmar<\/strong>.<\/li>\n\n\n\n<li style=\"font-size:17px\">Current mission emphasizes collaboration with Maldives for joint research.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Strategic Significance:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Supports Underwater Domain Awareness (UDA) for the Indian Navy.<\/li>\n\n\n\n<li style=\"font-size:17px\">Collects oceanographic and acoustic data along predefined observational tracks, aiding maritime security and research.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">About INS Sagardhwani:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Specialised marine acoustic research vessel, designed by NPOL and built by Garden Reach Shipbuilders &amp; Engineers (GRSE).<\/li>\n\n\n\n<li style=\"font-size:17px\">Commissioned in July 1994, operational for over three decades.<\/li>\n\n\n\n<li style=\"font-size:17px\">Serves as a platform for ocean observations, marine research, and underwater acoustic studies, enhancing India\u2019s maritime scientific capabilities.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Collaborative Outcomes:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Strengthens scientific cooperation, professional exchange, and capacity building among IOR countries.<\/li>\n\n\n\n<li style=\"font-size:17px\">Contributes to India\u2019s maritime scientific leadership and strategic engagement in the Indian Ocean region.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-ast-global-color-6-background-color has-background\">India\u2019s first open-sea Marine Fish Farming project<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Overview of the Initiative<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\"><strong>Launched by:<\/strong> Dr. Jitendra Singh, Union Minister of State (Independent Charge) for Science &amp; Technology, Earth Sciences, PMO, Personnel, Atomic Energy, Space, etc.<\/li>\n\n\n\n<li style=\"font-size:17px\"><strong>Location:<\/strong> North Bay, Andaman Sea (Sri Vijaya Puram, Andaman &amp; Nicobar Islands).<\/li>\n\n\n\n<li style=\"font-size:17px\"><strong>Significance:<\/strong> India\u2019s <strong>first-ever open-sea Marine Fish Farming project<\/strong>.<\/li>\n\n\n\n<li style=\"font-size:17px\"><strong>Vision:<\/strong> Unlock economic potential of India\u2019s oceans under the Blue Economy framework, emphasized by PM Narendra Modi.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Objectives and Intent<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Harness the economic potential of India\u2019s oceans, which remained largely underexplored for nearly 70 years after Independence.<\/li>\n\n\n\n<li style=\"font-size:17px\">Integrate scientific innovation with livelihood generation for coastal and island communities.<\/li>\n\n\n\n<li style=\"font-size:17px\">Promote marine aquaculture (finfish and seaweed cultivation) in natural ocean conditions.<\/li>\n\n\n\n<li style=\"font-size:17px\">Pilot project to enable future scaling via public\u2013private partnerships.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Project Implementation<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\"><strong>Collaborating agencies:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Ministry of Earth Sciences, Government of India<\/li>\n\n\n\n<li>National Institute of Ocean Technology (NIOT)<\/li>\n\n\n\n<li>Andaman &amp; Nicobar Islands UT Administration<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li style=\"font-size:17px\"><strong>Focus Areas:<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Marine fauna:<\/strong> Cage-based cultivation of finfish using NIOT-developed open-sea cages.<\/li>\n\n\n\n<li><strong>Marine flora:<\/strong> Deep-water seaweed cultivation; seaweed seeds distributed to local fishing communities.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li style=\"font-size:17px\">Supports livelihood enhancement, skill development, and local economic opportunities.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Key Highlights of the Field Visit<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Dr. Jitendra Singh emphasized the <strong>heterogeneous nature of India\u2019s oceans<\/strong>, with unique contributions from western, southern, and eastern seaboards.<\/li>\n\n\n\n<li style=\"font-size:17px\">The project represents a <strong>science-to-field approach<\/strong>, actively involving <strong>coastal and island communities<\/strong>.<\/li>\n\n\n\n<li style=\"font-size:17px\">Reinforces <strong>Blue Economy strategy<\/strong>, ensuring sustainable and inclusive utilization of ocean resources.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Related Site Visits<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Visited Mahatma Gandhi Marine National Park (MGMNP) near Wandoor:\n<ul class=\"wp-block-list\">\n<li>Established in 1983, first marine park of its kind in India.<\/li>\n\n\n\n<li>Spread across 15 islands, including Jolly Buoy and Red Skin.<\/li>\n\n\n\n<li>Rich marine biodiversity: coral reefs, mangroves, turtles, and various fish species.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li style=\"font-size:17px\">Observed sustainable and self-maintaining marine ecosystems, aligning with project goals.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Strategic Importance<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Demonstrates government commitment to the Blue Economy and ocean-led economic growth.<\/li>\n\n\n\n<li style=\"font-size:17px\">Combines livelihood creation, scientific research, and technological innovation.<\/li>\n\n\n\n<li style=\"font-size:17px\">Sets precedent for scaling through public-private partnership models, potentially covering larger regions in India\u2019s oceanic zones.<\/li>\n\n\n\n<li style=\"font-size:17px\">Supports India\u2019s position as a leader in marine aquaculture and sustainable ocean resource management.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-ast-global-color-6-background-color has-background\">Space-based Datacentres in Low Earth Orbit<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Core Idea<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Global datacentre electricity consumption is rising rapidly, driven primarily by AI workloads, especially large language models.<\/li>\n\n\n\n<li style=\"font-size:17px\">To address energy constraints and sustainability concerns, Google Research is exploring space-based datacentres powered entirely by solar energy under a concept called Project Suncatcher.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Why AI Datacentres Are Different<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Traditional datacentres scale mainly with content consumption (e.g., video), requiring similar inbound and outbound bandwidth.<\/li>\n\n\n\n<li style=\"font-size:17px\">AI datacentres require:\n<ul class=\"wp-block-list\">\n<li>Extremely high internal bandwidth for distributed training and inference<\/li>\n\n\n\n<li>Fast interconnects between GPUs\/TPUs rather than between servers and end users<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li style=\"font-size:17px\">Example:\n<ul class=\"wp-block-list\">\n<li>Microsoft\u2019s Fairwater AI datacentre complexes use petabit-per-second links between facilities.<\/li>\n\n\n\n<li>User-facing bandwidth is comparatively small, similar to how ChatGPT works today.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Rationale for Space-Based Datacentres<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Space offers:\n<ul class=\"wp-block-list\">\n<li>Continuous access to solar power, avoiding grid constraints and fossil-fuel reliance<\/li>\n\n\n\n<li>Reduced need for high-capacity Earth downlinks, since most data movement is internal<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li style=\"font-size:17px\">The idea reframes datacentres as compute clusters in orbit, not as Earth-facing infrastructure.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Project Suncatcher: Proposed Architecture<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Inspired by Starlink but fundamentally different:\n<ul class=\"wp-block-list\">\n<li>Satellites form tight, choreographed clusters, spaced only a few kilometres apart<\/li>\n\n\n\n<li>Clusters follow sun-synchronous orbits to maintain constant solar exposure<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li style=\"font-size:17px\">Key technologies:\n<ul class=\"wp-block-list\">\n<li>Inter-satellite high-bandwidth links<\/li>\n\n\n\n<li>Multiplexing to maximise data throughput per radio beam<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li style=\"font-size:17px\">Primary bandwidth demand is between satellites, not between space and Earth.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Hardware and Radiation Challenges<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Long-term exposure to solar and cosmic radiation poses risks to computing hardware.<\/li>\n\n\n\n<li style=\"font-size:17px\">Google testing shows:\n<ul class=\"wp-block-list\">\n<li><strong>High Bandwidth Memory (HBM)<\/strong> is the most radiation-sensitive component<\/li>\n\n\n\n<li>Irregularities appear only after <strong>2 krad(Si)<\/strong> \u2014 nearly <strong>3\u00d7 the expected 5-year dose<\/strong><\/li>\n\n\n\n<li>No hard failures observed up to <strong>15 krad(Si)<\/strong> on a single Trillium TPU chip<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li style=\"font-size:17px\">Conclusion:\n<ul class=\"wp-block-list\">\n<li>Google\u2019s TPUs appear <strong>unexpectedly radiation-resistant<\/strong>, strengthening feasibility.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Operational and Engineering Challenges<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\"><strong>Maintenance and repair<\/strong>:\n<ul class=\"wp-block-list\">\n<li>No cost-effective way to service or replace faulty hardware in orbit<\/li>\n\n\n\n<li>Requires fault-tolerant design and planned satellite replacement<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li style=\"font-size:17px\"><strong>Thermal management<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Space datacentres cannot rely on liquid cooling<\/li>\n\n\n\n<li>Must dissipate heat via radiation while being continuously exposed to solar energy<\/li>\n\n\n\n<li>Cooling in vacuum is a major unsolved challenge<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Economic Viability<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">The biggest unknown is whether space-based datacentres can compete with Earth-based ones.<\/li>\n\n\n\n<li style=\"font-size:17px\">Cost factors include:\n<ul class=\"wp-block-list\">\n<li>R&amp;D<\/li>\n\n\n\n<li>Launch and deployment<\/li>\n\n\n\n<li>Replacement of failed satellites<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li style=\"font-size:17px\">Google estimates:\n<ul class=\"wp-block-list\">\n<li>Satellite launch costs may fall to <strong>$200\/kg by the mid-2030s<\/strong><\/li>\n\n\n\n<li>Continuous solar power could offset operational energy costs<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li style=\"font-size:17px\">Economic feasibility depends on launch cost reductions outpacing advances in terrestrial datacentre efficiency.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Comparative Experiments and Precedents<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">Microsoft\u2019s Project Natick (underwater datacentres):\n<ul class=\"wp-block-list\">\n<li>Promising cooling advantages<\/li>\n\n\n\n<li>Ultimately abandoned due to practical and economic constraints<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li style=\"font-size:17px\">Indicates that radical datacentre experiments can fail despite technical promise.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Broader Context and Outlook<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:17px\">ISRO is reportedly also studying space-based datacentres, suggesting global interest.<\/li>\n\n\n\n<li style=\"font-size:17px\">Historical precedent:\n<ul class=\"wp-block-list\">\n<li>Early scepticism about satellite internet mirrors current doubts<\/li>\n\n\n\n<li><strong>Starlink\u2019s success<\/strong> shows how quickly satellite technologies can mature.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>INS Sagardhwani and Sagar Maitri-5 (SM-5) Vessel &amp; Mission: Purpose of Sagar Maitri: Scientific Component \u2013 MAITRI: Mission Details: Strategic Significance: About INS Sagardhwani: Collaborative Outcomes: India\u2019s first open-sea Marine Fish Farming project Overview of the Initiative Objectives and Intent Project Implementation Key Highlights of the Field Visit Related Site Visits Strategic Importance Space-based Datacentres [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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