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Obituary: R. Chidambaram, Eminent Physicist and Architect of India’s Nuclear Program

Rajagopala Chidambaram (1936–2025), a man whose work shaped the future of modern India, will always be remembered as the chief architect of India’s nuclear journey.

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Rajagopala Chidambaram, a world-class physicist and the chief architect of India’s nuclear program, passed away on January 4, 2025, at the age of 88. Renowned for his unparalleled contributions to India’s nuclear defense and energy security, Chidambaram leaves a profound legacy in both the scientific community and the nation’s strategic defense apparatus.

Born on November 11, 1936, in India, Dr. Chidambaram was an alumnus of Presidency College, Chennai, Tamil Nadu, and the Indian Institute of Science, Bengaluru, Karnataka. His academic background, coupled with his innate curiosity and vision, led him to become one of India’s foremost scientific minds. Throughout his illustrious career, Dr. Chidambaram played an instrumental role in shaping India’s nuclear capabilities, overseeing both the Pokhran-I (1974) and Pokhran-II (1998) nuclear tests, which cemented India’s position as a nuclear power on the world stage.

As a physicist, Dr. Chidambaram’s groundbreaking research in high-pressure physics, crystallography, and materials science greatly advanced the understanding of these fields. His pioneering work laid the foundation for modern materials science research in India, contributing to the nation’s scientific progress in multiple areas. His expertise in these complex disciplines not only bolstered India’s nuclear research but also advanced its technological prowess.

In addition to his work in nuclear weapons development, Dr. Chidambaram made significant strides in nuclear energy, ensuring that India remained at the forefront of scientific and technological advancements. As Director of the Bhabha Atomic Research Centre (BARC) and later as Chairman of the Atomic Energy Commission of India, he was integral to India’s peaceful nuclear energy initiatives. As Principal Scientific Adviser to the Government of India, Dr. Chidambaram guided national policies on defense, energy, and nuclear research, shaping the future of India’s scientific endeavors.

He was a vital member of the team that conducted India’s first nuclear test, Smiling Buddha, at Pokhran in 1974. His leadership during the Pokhran-II tests in 1998, which confirmed India’s nuclear deterrent, was a defining moment in the nation’s history. Chidambaram’s steadfast commitment to India’s defense and scientific advancement earned him respect both at home and abroad.

Rajagopala Chidambaram
Rajagopala Chidambaram captured during the session ‘Innovative India’ at the Annual Meeting 2008 of the World Economic Forum in Davos, Switzerland. Copyright by World Economic Forum/Photo by Monika Flueckiger

A visionary leader, Dr. Chidambaram believed in the power of science and technology to drive national development. His efforts were instrumental in championing key initiatives in energy, healthcare, and strategic self-reliance. He steered numerous projects that significantly advanced India’s science and technology landscape. Notably, he played a central role in the indigenous development of supercomputers and was the driving force behind the conceptualization of the National Knowledge Network, which connected research and educational institutions across India.

Dr. Chidambaram was also an ardent advocate for the application of science and technology to improve societal conditions. He established the Rural Technology Action Groups and the Society for Electronic Transactions and Security, among other programs. His emphasis on “Coherent Synergy” in India’s scientific efforts helped foster collaboration across various disciplines, accelerating the country’s scientific growth.

On the global stage, Dr. Chidambaram served as the Chairman of the Board of Governors of the International Atomic Energy Agency (IAEA) in 1994-1995 and contributed to several high-level international nuclear discussions. His expertise was sought worldwide, and in 2008, he was appointed to the Commission of Eminent Persons by the IAEA to assess the agency’s role in nuclear governance.

He was a vital member of the team that conducted India’s first nuclear test, Smiling Buddha, at Pokhran in 1974

In recognition of his exceptional contributions to science and national development, Dr. Chidambaram received several prestigious accolades, including the Padma Shri in 1975 and the Padma Vibhushan in 1999. He was also awarded honorary doctorates from several universities and was a fellow of several eminent Indian and international scientific academies.

Dr. Chidambaram’s passing marks the end of an era for India’s nuclear program and the global scientific community. His legacy as a scientist, visionary leader, and architect of India’s nuclear journey will continue to inspire future generations. His contributions to national security, energy, and technological innovation have left an indelible mark on India’s scientific and strategic landscape.

Rajagopala Chidambaram’s profound impact on India’s nuclear and scientific trajectory will be remembered for generations to come. His work in advancing both national defense and the peaceful use of nuclear energy stands as a testament to his vision of a self-reliant, scientifically empowered India.

“Deeply saddened by the demise of Dr Rajagopala Chidambaram. He was one of the key architects of India’s nuclear programme and made ground-breaking contributions in strengthening India’s scientific and strategic capabilities. He will be remembered with gratitude by the whole nation and his efforts will inspire generations to come,” Prime Minister Narendra Modi wrote on X.

Dr. Ajit Kumar Mohanty, Secretary, Department of Atomic Energy, in a statement issued, said,  “Dr. Chidambaram was a doyen of science and technology whose contributions furthered India’s nuclear prowess and strategic self-reliance. His loss is an irreparable one for the scientific community and the nation.”

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Space & Physics

NASA announces crew of Artemis III at live event

Artemis III will be the agency’s next human space exploration mission paving the way for humanity’s planned return to the moon in 2028.

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The Artemis III crew poses for an official portrait (from left: Andre Douglas, Luca Parmitano, Randy Bresnik, Frank Rubio). Credit: NASA/Bill Stafford

At 20:30 hours IST yesterday, NASA’s Johnson Space Center in Houston, Texas held a live event their engineers, scientists, the astronaut corps and the media attended. The space agency officially announced the crew of Artemis III, the agency’s next human space exploration mission, paving the way for humanity’s planned return to the moon in 2028, over fifty years after the Apollo program.

Half-way through the hour-long presentation, Jared Isacson, the NASA administrator, walked to the dais to announce the all-men crew of Artemis III: NASA mission commander Randy Bresnik, mission specialists Andre Douglas and Frank Rubio, and European Space Agency pilot Luca Parmitano, an Italian national. 

Three of the astronauts excluding Douglas, a US Coast Guard reserve, are both spaceflight and military veterans. Bresnik, a US marine colonel and test pilot clocking 7,000 hours, commanded the International Space Station. So did Parmitano, the first Italian commander of the station, and who survived a 2013 spacewalk when water abruptly filled his helmet and had an asteroid named after him. Rubio, a US army helicopter pilot, holds the record for the longest time spent in space. 

NASAs Artemis III Announcement 38 40 screenshot

Screengrab from the YouTube livestream of the event at NASA Johnson Space Center, Houston, Texas. Credit: NASA

Mission timeline

The mission could take off in the second-half of 2027. Originally,  NASA planned Artemis III to be the first soft-landing lunar mission since 1972’s Apollo 17, with a slated launch date in 2028. However, in March, the agency updated mission timelines, with the mission relegated for testing its mission critical docking mechanism, ahead of Artemis IV’s planned soft-landing that year.

The crew will fly aboard a Space X Orion capsule into low-earth orbit. Unlike its predecessor, Artemis III won’t leave earth orbit and conduct a flyby past the moon. Instead, it will test life support systems and docking with Artemis’ era lunar landers, built by private space companies Space X and Blue Origin, the Starship Human Landing System (HLS) and the Blue Moon respectively. In addition, Artemis III will carry on science experiments, including using instrumentation to test effects of atmospheric drag upon the spacecraft, amidst hostile space weather.

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The Apollo and Artemis-era lunar landers drawn to scale. Credit: NASA

Lunar landers 

There has been skepticism whether the Blue Moon lunar lander’s launch schedule would be affected, in the aftermath of last week’s mishap involving New Glenn, the flagship rocket of Jeff Bezos-owned Blue Origin, exploding during a hot-static test ahead of its slated launch of Amazon’s satellites. The explosion destroyed the company’s custom-developed launchpad at Cape Canaveral Space Force Station in Florida. However, the company CEO, David Limp, posted on X, they’ll return to full-swing operations latest before the end of this year.

Whereas Starship HLS, the other lunar lander design, will feature a variant of the Starship rocket, with the latter design being still tested over repeated space flights in the past year. 

Either lunar landers designed to ferry astronauts from lunar orbit to the surface, and back. In a future Artemis mission, the astronauts, who will ride aboard Space X’s Orion crew module from earth, will dock with the lander in lunar orbit, before transferring to the lander module. 

It’s unclear which lander design’s slated to make the soft-landing attempt in Artemis IV. 

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Engineers Develop Dual-Mode Propulsion System for Next-Generation Small Satellites

MIT engineers have developed a dual-mode propulsion system that combines chemical and electric thrusters, giving small satellites greater flexibility in space

Joe Jacob

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MIT researchers testing a dual-mode propulsion system designed to power next-generation small satellites using a shared propellant tank.
MIT-developed electrospray thrusters prepared for NASA's Green Propulsion Dual Mode mission, a demonstration of next-generation propulsion technology for CubeSats. Photo: Amelia Bruno/MIT News

Dual-mode propulsion system technology developed by MIT engineers could give small satellites the ability to perform both powerful manoeuvres and fuel-efficient long-distance travel using a single propellant source.

Small satellites have transformed space research by making missions cheaper and more accessible. Yet they continue to face a fundamental limitation: propulsion.

Traditional chemical thrusters provide powerful bursts of speed but consume large amounts of fuel. Electric propulsion systems, on the other hand, are highly efficient but generate only gentle thrust over long periods. Spacecraft designers have typically had to choose between the two.

Engineers at the Massachusetts Institute of Technology (MIT) now believe they have found a way to combine both approaches in a single compact system, potentially giving small satellites the agility of much larger spacecraft.

The breakthrough centres on a special propellant capable of powering both chemical and electric thrusters from the same fuel tank.

“If you can have chemical and electrical propulsion in one small package, it’s the best of both worlds,” said Amelia Bruno, lead author of the study and a former postdoctoral researcher in MIT’s Department of Aeronautics and Astronautics, in a media statement.

“This opens the door for small satellites to do even more science, more observations, and more interesting missions, all on a smaller and cheaper platform.”

The findings have been published in the Journal of Propulsion and Power.

Dual-Mode Propulsion System Combines Two Technologies

The MIT team tested a propellant known as Advanced SpaceCraft Energetic Non-Toxic propellant, or ASCENT. Originally developed by the U.S. Air Force as a safer alternative to hydrazine, ASCENT was designed for chemical propulsion systems.

Researchers discovered that the same propellant can also power miniature electric propulsion devices known as electrospray thrusters.

These tiny thrusters use electric fields to charge particles within a liquid propellant and eject them into space, creating precise and fuel-efficient thrust. While chemical thrusters are ideal for rapid manoeuvres, electrospray systems are better suited for gradual course corrections and long-duration journeys.

By enabling both systems to share a single fuel source, the technology could significantly reduce the size and complexity of propulsion systems aboard CubeSats and other small spacecraft.

Dual-Mode Propulsion System Could Expand Deep-Space Missions

Dual-mode propulsion system can expand deep-space missions. The implications extend beyond Earth orbit.

CubeSats have become popular for scientific research and technology demonstrations, but their limited propulsion capabilities have restricted their use in deep-space missions.

According to Paulo Lozano, the Miguel Alemán Velasco Professor of Aeronautics and Astronautics at MIT, the new system could change that.

“We could send CubeSats to Mars, or the asteroid belt, where they could make the journey slowly, using electrospray thrusters,” he said.

“You could then use your chemical thrusters to quickly move to look at interesting features. You could have a lot more flexibility to do a lot more things.”

Testing the Technology

To evaluate the propellant’s performance, the researchers filled small CubeSat reservoirs with ASCENT and tested them in a vacuum chamber designed to simulate conditions in space.

During the experiments, electrospray thrusters powered by ASCENT successfully generated thrust for extended periods, in some cases operating continuously for up to 100 hours.

NASA Mission Will Put the Technology to the Test

The next major test will come later this year.

MIT researchers are working with NASA on the Green Propulsion Dual Mode mission, a CubeSat that will carry both chemical and electrospray thrusters powered by a single propellant tank. Scheduled for launch in November, the mission will be the first demonstration of such a system in a small spacecraft.

If successful, the mission could help pave the way for a new generation of versatile satellites capable of switching between rapid manoeuvres and highly efficient long-distance travel.

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India Semiconductor Mission: ‘It’s Not About Fabs. It’s About Building An Entire Ecosystem’

India Semiconductor Mission is reshaping the country’s chip ambitions. Neelkanth Mishra explains the opportunities, challenges and long-term strategy.

Dipin Damodharan

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Neelkanth Mishra, Chief Economist at Axis Bank and member of the India Semiconductor Mission advisory committee, speaking about India's semiconductor ambitions and chip ecosystem.
From extreme ultraviolet lithography to the economics of fabrication, semiconductors sit at the intersection of advanced science and industrial complexity. Neelkanth Mishra unpacks where India stands today, the constraints it faces, and the strategic choices that will define its place in the global chip ecosystem. Image: Dipin Damodharan/EdPublica
India Semiconductor Mission is at the centre of the country's efforts to build a globally competitive chip ecosystem
Photo by Christian Wiediger/Unsplash

Let me start with asking something out of curiosity – how did you get interested in semiconductors in the first place?

When I joined Credit Suisse First Boston in 2003 in Singapore, the person who hired me was heading Asia technology research and was also the lead analyst for semiconductor foundries such as TSMC and UMC. I was hired to cover IT services, but he wanted help in building the semiconductor research franchise.

That led me to start reading about how chips are made. At that time, the industry was transitioning from 130-nanometer to 90-nanometer nodes, and copper was being introduced to replace aluminum due to resistance issues. There were challenges around yields because copper was seeping into substrates. I remember writing my first note around this issue after going through technical papers.

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That note became quite popular, and it gave me the confidence to continue covering semiconductors. I spent a lot of time travelling to Taiwan, studying DRAM cycles, capex cycles, node transitions, and the broader global semiconductor ecosystem. Eventually, I moved to Taipei and began covering chip design companies such as MediaTek.

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At that time, were you also tracking what was happening in India?

India has had chip design activity for a long time, even in the 1990s. Companies like Texas Instruments, Cadence, and Synopsys were recruiting from Indian campuses. Many engineers built long careers in these firms.

However, India did not have domestic chip manufacturing or strong Indian-owned chip design companies. By the mid-2000s, global firms such as Nvidia, Broadcom, and Intel began setting up design centres in India. So the design ecosystem was growing, but it was largely driven by global companies.

It is only in the last four to five years that more serious efforts have begun toward building Indian-owned capabilities.

So what changed in the last few years? Was it policy, or something else?

Policy has played a role. The Design Linked Incentive (DLI) scheme has been an important catalyst. We are seeing some early success. At the same time, there is also an evolutionary factor at play. Engineers who moved abroad 20–25 years ago are now at a stage where they have both the experience and financial capacity to take entrepreneurial risks. Many also want to return to India.

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Another important factor is the growth of India’s electronics manufacturing ecosystem. As assembly volumes increase, there is greater awareness of what products need to be designed. Without that visibility into OEM pipelines, it is difficult to design chips.

Schemes like PLI for electronics manufacturing have helped build that awareness and ecosystem. As downstream industries grow, upstream opportunities in chip design also become clearer.

As US is good at designing chips, Taiwan and South Korea are good at manufacturing There’s always this question – should India focus on design, manufacturing, or packaging?

There is no either/or. India needs to participate across the value chain.

We already have a natural advantage in chip design, with about 20% of global design engineers based in India. Design is also less capital-intensive compared to manufacturing. In a $10 chip, $5–6 of value is captured by the designer, and in some cases even more.

At the same time, semiconductor manufacturing is a geopolitical necessity. It is not just a commercial issue but also a matter of national security. That is why governments provide significant subsidies for fabs.

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However, manufacturing is a low-return business globally. Only a few companies like TSMC and Samsung have consistently generated returns above their cost of capital. Much of the value in the ecosystem is captured by design firms and by capital equipment suppliers, which operate in highly concentrated markets.

Therefore, India must build capabilities across the chain—from design to manufacturing to equipment and materials—if it wants meaningful value capture.

When we talk about building an ecosystem, how complex is that in reality?

It is extremely complex. The industry has multiple layers of specialization. For example, electronic design automation (EDA) tools are dominated by a few companies. Lithography, especially extreme ultraviolet, is controlled by a single company globally. Equipment for deposition, wafer slicing, and testing is also concentrated among a handful of firms.

Even the chemicals used in wafer cleaning are highly sophisticated and require extraordinary purity. A single wafer can take months to manufacture, involving hundreds of process steps.

So when we talk about semiconductors, it is not just about fabs. It is about building an entire ecosystem—equipment, materials, design, testing, and packaging. This is why it is a 15–20 year journey at least.

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Image credit: Taiwan Semiconductor Manufacturing Co., Ltd

What about talent? Are we ready from a skills perspective?

In general, skilling in India is more of a demand problem than a supply problem. If there is sufficient demand, the industry tends to create the supply.

For example, there is already discussion about developing tens of thousands of chip testing engineers in India, and that is achievable. However, for cutting-edge technologies, there is a need for deeper investment in research.

As we move toward more advanced nodes—such as 7 to 12 nanometers—we will require significant high-end research capabilities. Countries like China took over 25 years to reach that level.

We need to invest not just in near-commercial research (TRL 6–9) but also in fundamental research (TRL 1–4), which creates long-term intellectual property. Government initiatives like the Anusandhan National Research Fund are steps in that direction, but overall R&D spending needs to increase.

What role should industry play in R&D?

Industry participation is essential. The government can catalyse investment, but companies will invest when they see potential returns.

We have seen this in pharmaceuticals, where Indian firms moved into R&D after reaching limits in generics. A similar shift can happen in semiconductors, but it will require scale, capital, and long-term commitment.

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Where do startups fit into this picture?

Startups will have a significant role, particularly in chip design. Manufacturing is extremely capital-intensive, requiring billions of dollars in investment, which limits the role of startups.

However, in design and innovation, startups can play an important part. Many innovations in the semiconductor ecosystem originate from smaller firms, which are later acquired or integrated into larger companies.

To produce a globally competitive company, you need a large ecosystem of startups, experimentation, and risk-taking.

Coming to policy – what did India learn from ISM 1.0?

ISM 1.0 (India Semiconductor Mission) was a learning curve for everyone. It helped the government understand how to evaluate proposals, support companies, and manage operational challenges.

There were practical issues—from customs procedures affecting sensitive equipment to ensuring uninterrupted power supply. Semiconductor manufacturing requires extremely high reliability, and even a brief power outage can cause significant losses.

Another important learning is that the global industry is now more comfortable working with India. While India may not yet be the first choice, confidence has improved due to visible commitment and progress.

This increased comfort allows India to be more ambitious with ISM 2.0.

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Photo by Laurel and Michael Evans/Unsplash

How important is policy stability?

Policy continuity is very important because these are long-term projects. Global firms value consistency in decision-making and relationships.

There is also a growing effort to ensure continuity in leadership within government institutions, which helps build expertise and trust over time.

Do we need a dedicated semiconductor research institution like IMEC?

There are existing efforts, such as the facility in Mohali, which supports defence-related applications. There are also discussions around creating IMEC-like research centres.

However, over time, the private sector will need to take a larger role in research. Government support is critical in the early stages, but for sustained innovation and competitiveness, industry-led initiatives are more effective. The government can act as the binding force or the catalyst that brings people to the table; however, I believe it is ultimately better if the private sector takes the lead. This creates a natural incentive for innovation and rigorous research. Beyond a certain point, government support becomes both fiscally unfeasible and operationally undesirable

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If we look ahead 20 years, where do you see India?

On the design side, India can become much more significant. It is possible to see 10–15 large chip design companies and many smaller firms emerging.

On the manufacturing side, we could have several large fabs and potentially global players establishing operations in India, especially if a strong domestic design ecosystem develops.

For example, companies like TSMC tend to follow innovation ecosystems. If Indian design firms grow in scale and sophistication, it could attract global manufacturing investments.

Neelkanth Mishra, Chief Economist at Axis Bank and member of the India Semiconductor Mission advisory committee, speaking about India's semiconductor ambitions and chip ecosystem.

Let me end with this – can India produce a company like Nvidia?

It is possible, but it requires a large ecosystem. Many Indians already occupy senior roles in global semiconductor companies and are involved in cutting-edge design work.

To create a company of that scale, you need risk capital, entrepreneurial ambition, and a large number of startups. In other markets, hundreds of firms compete, and one eventually emerges as a dominant player.

So it is not about a single effort—it is about building an ecosystem where many experiments take place, and success emerges from that.

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