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Is Time Travel Possible? Exploring the Science Behind the Concept

Subtle forms of time travel — such as time dilation — do occur and have practical implications in science and technology.

Veena M A

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Everyone is, in a way, a time traveller. Whether we like it or not, we are constantly moving through time — one second per second. From one birthday to the next, we travel through time at a steady pace, just like walking one foot per footstep. However, when we talk about “time travel,” we often imagine something much more dramatic — traveling faster (or even backward) through time, as seen in science fiction movies and novels. But is such a thing truly possible?

From Fiction to Science

The concept of time travel first gained widespread attention through literature, particularly with H.G. Wells’ 1895 novel The Time Machine. In it, time is described as the fourth dimension, akin to space, and the protagonist travels forward and backward in time using a specially built machine. Interestingly, this idea predates Albert Einstein’s theory of relativity, which would later reshape how we understand space and time.

The Time Machine H. G. Wells William Heinemann 1895 title page
Image credit: Wikimedia Commons

Einstein’s Contribution: Relativity and Time Dilation

In the early 20th century, Albert Einstein introduced a revolutionary idea through his theory of relativity. He proposed that space and time are interconnected, forming a four-dimensional continuum called space-time. According to his theory, the speed of light (186,000 miles per second) is the ultimate speed limit in the universe. But how does this relate to time travel?
Einstein’s theory states that as you move faster — especially at speeds approaching the speed of light — time slows down relative to someone who is stationary. This phenomenon, known as time dilation, has been proven through various experiments. One famous example involved two synchronized atomic clocks — one placed on Earth and the other onboard a high-speed jet. When the plane returned, the onboard clock showed slightly less time had passed compared to the one on the ground. This demonstrates that, at very high speeds, time passes more slowly.

Astronaut Twins and Time

A notable example of time dilation involved twin astronauts Scott and Mark Kelly. Scott spent 520 days aboard the International Space Station, while Mark spent only 54 days in space. Due to the effects of time dilation, Scott aged slightly less than Mark — by about 5 milliseconds. Though this difference is minuscule, it is real and measurable, showing that time can indeed “bend” under certain conditions.

The GPS Example

Surprisingly, even GPS satellites experience time differently than we do on Earth. These satellites orbit at altitudes of about 20,200 kilometers and travel at speeds of roughly 14,000 km/h. Due to both their speed (special relativity) and weaker gravitational pull at high altitudes (general relativity), time ticks slightly faster for the satellites than for devices on Earth. This discrepancy is corrected using Einstein’s equations to ensure precise positioning. Without these adjustments, GPS systems could be off by several miles each day.

Science Fiction vs. Scientific Reality

Science fiction has long explored imaginative time travel — characters jumping into machines and traveling decades into the future or past. Stories often depict them altering historical events or witnessing the far future. However, there is no scientific evidence that anyone has travelled backward or forward in time in such a dramatic way.

Renowned physicist Stephen Hawking addressed this idea humorously in 2009. He hosted a party for time travellers — but only announced it afterward, reasoning that if time travel were possible, people from the future would show up. No one came. Hawking took this as a tongue-in-cheek sign that backward time travel may not be feasible.

Could Wormholes Be the Key?

Theoretical physics does suggest possibilities like wormholes — shortcuts through space-time. According to Einstein’s equations, these could, in theory, connect distant places and times. A wormhole might allow someone to enter at one point in space and exit at another, potentially in a different time. However, this remains purely speculative. The extreme gravitational forces within black holes or wormholes could destroy anything attempting to pass through.
Moreover, the idea of backward time travel introduces major paradoxes — such as the classic “grandfather paradox,” where someone goes back in time and prevents their own existence. Such contradictions challenge our understanding of causality and logic.

The Limitations of Current Science

At present, building a time machine capable of transporting people backward or forward in time by centuries remains outside the realm of scientific possibility. It’s a concept best enjoyed in novels and films for now. However, subtle forms of time travel — such as time dilation — do occur and have practical implications in science and technology.

While we may not have DeLoreans or TARDISes at our disposal, time travel — at least in small, measurable ways — is a part of our reality. The interplay of speed, gravity, and time demonstrates that our universe is far more flexible than it appears. And who knows? In some distant corner of the cosmos, nature might already be bending time in ways we are only beginning to imagine.

Until then, we’ll keep moving forward — one second per second.

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Space & Physics

Skyroot: The Rise of Private Rockets in India’s Space Economy

Skyroot Aerospace has become the first Indian private company to place a rocket into orbit with the successful maiden flight of Vikram-1. Beyond a technological milestone, the mission signals India’s growing role in the global commercial space economy and the rise of private launch providers.

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Skyroot Aerospace's Vikram-1 rocket stands on the launch pad at the Satish Dhawan Space Centre ahead of its historic maiden mission, becoming the first Indian private rocket to reach orbit.
Skyroot Aerospace's Vikram-1 launch vehicle on the launch pad before its successful maiden mission from the Satish Dhawan Space Centre on July 18. The mission made Vikram-1 the first privately developed Indian rocket to reach orbit. Image credit: X/SkyrootA

India’s commercial space sector reached a new milestone on July 18 when Skyroot Aerospace successfully launched its Vikram-1 rocket into orbit, becoming the first Indian private company to do so. More than a technological achievement, the mission reflects the rapid evolution of India’s private space ecosystem—from supporting national missions to building and launching orbital rockets of its own.

The rocket lifted off from the Satish Dhawan Space Centre after a 35-minute delay caused by a technical issue detected during the final countdown. It followed its planned flight profile, with all three solid-fuel stages performing as expected before the Orbit Adjustment Module (OAM) completed the final burn, placing the mission into a 450-kilometre low Earth orbit about 15 minutes after launch.

Skyroot
Engineers carry out the final assembly and integration of Skyroot Aerospace’s Vikram-1 launch vehicle at the Satish Dhawan Space Centre before its successful maiden mission to orbit. Image credit: X/SkyrootA

A Maiden Mission That Delivered

The mission was named Aagaman, sanskrit word meaning “arrival”. The flight carried two CubeSats, one developed by Skyroot and another by Indian startup Grahaa Space. It also transported hosted payloads from Dcubed and Cosmoserve Space, along with commemorative items, including postcards signed by Prime Minister Narendra Modi.

Ahead of the launch, Skyroot co-founder and Chief Executive Officer Pawan Kumar Chandana described the mission as the company’s first real opportunity to validate years of engineering in flight. After the successful launch, he called it “a historic moment” for both Skyroot and India.

“Reaching orbit on the first attempt—I never thought it was possible, but the Skyroot team made it happen,” Chandana said.

A Milestone for India’s Space Sector

The launch is also a significant moment for India’s commercial space ambitions. Since opening the space sector to private participation, the government has introduced reforms, created IN-SPACe to promote and regulate private space activities, and expanded access to ISRO’s launch infrastructure.

Skyroot’s success is among the strongest indicators yet that those reforms are translating into operational capability. It also strengthens India’s position in the fast-growing global market for small satellite launches.

Demand for small satellite launches is rising worldwide, driven by Earth observation, climate monitoring, communications and defence. By becoming the first Indian private company to reach orbit, Skyroot joins a relatively small group of commercial launch providers globally, giving satellite operators another option in an increasingly competitive market. The achievement also reflects a broader shift in the global space industry, where private companies are taking on roles once reserved for national space agencies.

What Comes Next

Vikram-1 can carry payloads of up to 350 kilograms to low Earth orbit. Skyroot is developing Vikram-1U, an upgraded variant with strap-on boosters that will increase the payload capacity to 550 kilograms, and plans additional Vikram-1 launches before starting regular commercial operations.

The company recently raised $60 million to expand production and accelerate development of its next-generation Vikram-2 rocket.

With Vikram-1’s successful debut, India’s private space industry has crossed an important threshold—showing that homegrown startups are now capable of developing and launching orbital-class rockets, opening a new chapter in the country’s space journey.

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From Assembly to Silicon: India’s Long Road to Semiconductor Self-Reliance

India is building a semiconductor ecosystem through fabrication, packaging, chip design and Mission 2.0 to reduce imports and strengthen technology leadership.

Joe Jacob

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What India Semiconductor Mission 2.0 Changes
Image credit; Miguel Á. Padriñán/Pexels

For decades, India excelled at writing the software that powered the world’s computers but remained almost entirely dependent on other countries for the chips inside them. Every smartphone, fighter aircraft, satellite, electric vehicle, telecom network and artificial intelligence system relied on semiconductors designed and manufactured largely outside India’s borders.

That dependence has become one of the country’s biggest strategic vulnerabilities.

Today, India is attempting to change that.

How the India Semiconductor Mission Began

What began as an industrial policy is steadily evolving into a national technology mission—one that seeks not merely to manufacture chips, but to build an ecosystem spanning design, fabrication, advanced packaging, materials, equipment and skilled talent. If successful, it could reshape India’s manufacturing landscape and strengthen its position in a global technology race increasingly defined by semiconductor capabilities.

The launch of the India Semiconductor Mission (ISM) marked a turning point. Rather than offering isolated incentives, the government adopted a mission-driven approach aimed at creating an end-to-end semiconductor ecosystem. The objective extends beyond attracting investment; it is about ensuring technological sovereignty in a world where access to chips increasingly determines economic resilience and national security.

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–says Neelkanth Mishra, in an interview with EdPublica.

Why semiconductors matter

Semiconductors are often described as the “brains” of modern electronics, but their strategic significance runs far deeper.

Every sector that governments now classify as critical—artificial intelligence, defence, space, telecommunications, medical devices, automobiles, renewable energy and industrial automation—depends on increasingly sophisticated chips.

The COVID-19 pandemic exposed how vulnerable global supply chains had become. Factory shutdowns in one part of the world disrupted automobile production thousands of kilometres away. Geopolitical tensions further highlighted the risks of concentrating semiconductor manufacturing in only a handful of countries.

For India, which imports billions of dollars’ worth of electronic components every year, the lesson was unmistakable: technological ambition cannot rest entirely on imported hardware.

Building the foundation

Recognising this challenge, the government launched India Semiconductor Mission 1.0, backed by a financial incentive programme worth ₹76,000 crore. It represented India’s first coordinated attempt to build semiconductor manufacturing capabilities within the country.

The mission was designed to support multiple segments simultaneously:

>> silicon wafer fabrication plants;

>> assembly, testing, marking and packaging (ATMP) facilities;

>> Outsourced Semiconductor Assembly and Test (OSAT) units;

>> compound semiconductor manufacturing;

>> semiconductor design through the Design Linked Incentive (DLI) Scheme.

Rather than relying on a single mega-project, policymakers attempted to create an ecosystem in which manufacturing, design, packaging and supply chains could evolve together.

From policy announcements to factories

One of the biggest criticisms of India’s earlier electronics programmes was that announcements often outpaced execution.

This time, the picture is beginning to look different.

Approved semiconductor projects now represent cumulative investment commitments exceeding ₹1.64 lakh crore, spread across multiple states. According to the Ministry of Electronics and Information Technology, the approved portfolio now covers fabrication facilities, packaging plants and compound semiconductor manufacturing, reflecting a broader industrial base than initially envisioned.

The most visible milestone has been the commencement of commercial production at Micron Technology’s advanced semiconductor packaging facility in Gujarat, widely regarded as the first major operational success under the mission.

Several other large projects—including those led by Tata Electronics, Kaynes Semicon, and the Tata-PSMC semiconductor fabrication project at Dholera—have moved into advanced stages of construction and are expected to enter commercial production soon. Together, they represent India’s first serious attempt to establish domestic silicon manufacturing at scale.

Equally significant is the geographical spread.

Instead of concentrating semiconductor manufacturing in one industrial cluster, projects are now emerging across Gujarat, Rajasthan and other states, creating the beginnings of a distributed semiconductor manufacturing network.

Manufacturing is only one piece of the puzzle

Building chips requires far more than fabrication plants.

A modern semiconductor ecosystem depends on hundreds of specialised suppliers producing chemicals, gases, ultra-pure materials, precision equipment, packaging technologies and printed circuit boards (PCBs).

Recognising these gaps, the government has started extending policy support beyond chip fabrication.

A recent example is the foundation of advanced PCB manufacturing projects worth about ₹6,750 crore in Jewar, Uttar Pradesh. These facilities are expected to manufacture high-density multilayer PCBs—including advanced 20-22 layer boards—that India has traditionally imported in large quantities.

India Semiconductor Mission chip manufacturing facility
Image credit/Pok Rie / Pexels

Reducing imports of such critical components strengthens the broader electronics manufacturing ecosystem while creating domestic capabilities that extend well beyond semiconductor fabrication itself.

Design remains India’s strongest advantage

While fabrication receives most public attention, India already possesses one major strength: semiconductor design.

Thousands of engineers employed by global companies already design chips from Indian engineering centres. The challenge has been converting this design talent into domestic intellectual property.

The Design Linked Incentive (DLI) Scheme attempts to bridge that gap.

According to government data, the programme has supported dozens of chip design projects, enabled successful tape-outs, encouraged patent filings and provided advanced chip-design tools to more than 100 companies while training a growing pool of specialised semiconductor engineers.

Moving from outsourced engineering services towards Indian-owned semiconductor intellectual property could prove just as significant as establishing fabrication plants.

The next chapter: ISM 2.0

If the first phase focused on attracting semiconductor manufacturing, the next phase aims to deepen India’s role across the entire value chain.

Announced in the Union Budget 2026-27, India Semiconductor Mission 2.0 shifts attention towards areas where India still depends heavily on imports.

The new phase proposes support for:

>> semiconductor manufacturing equipment;

>> specialty materials and chemicals;

>> indigenous semiconductor intellectual property;

>> advanced packaging technologies;

>> compound semiconductors;

>> industry-led research and training centres.

The underlying philosophy is straightforward: long-term self-reliance cannot be achieved by importing all the machinery, chemicals and specialised materials required to manufacture chips.

Instead, India aims to build capabilities throughout the production chain—from research laboratories to finished semiconductor products.

Recent reports indicate that the government is also preparing a substantially larger financial commitment for ISM 2.0 as it expands beyond manufacturing incentives into ecosystem development.

Strategic partnerships without strategic dependence

India’s semiconductor strategy has deliberately combined domestic capability building with international collaboration.

Leading companies from the United States, Taiwan, Japan and South Korea have become partners in India’s emerging semiconductor ecosystem, bringing technology, manufacturing expertise and investment.

This reflects a broader policy shift.

Rather than attempting complete technological isolation, India is seeking trusted international partnerships while gradually strengthening indigenous capabilities in manufacturing, design and supply chains.

In an increasingly fragmented global technology landscape, diversification itself has become a strategic asset.

The road ahead remains difficult

Despite visible progress, India’s semiconductor journey is still in its early stages.

Chip fabrication demands extraordinary precision, massive capital investments, reliable infrastructure and uninterrupted supplies of ultra-pure water, electricity and specialised materials. Success also depends on building a workforce capable of operating some of the world’s most sophisticated manufacturing facilities.

Moreover, semiconductor manufacturing is measured in decades, not election cycles.

Countries that dominate the industry today invested consistently over many years before becoming global leaders.

India therefore faces the challenge of maintaining policy continuity while ensuring that announced projects translate into commercially competitive production.

A larger national ambition

The significance of India’s semiconductor mission extends well beyond electronics manufacturing.

Every fabrication facility commissioned, every packaging unit established and every design company supported reduces import dependence, creates highly skilled employment and strengthens India’s position within global technology supply chains.

For a country seeking greater strategic autonomy, semiconductor capability is increasingly becoming as important as energy security or defence preparedness.

The first phase of the mission has established the initial building blocks. The second phase aims to strengthen the ecosystem beneath them.

Whether India ultimately becomes a major global semiconductor hub will depend not on a single factory or policy announcement, but on its ability to sustain investment, develop talent, encourage innovation and build an integrated value chain over the coming decade.

After years of watching the global semiconductor revolution from the sidelines, India has entered the race. The challenge now is to ensure that today’s investment commitments become tomorrow’s manufacturing capability—and eventually, technological leadership.

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MIT develops ultra-low-power chip that could help tiny robots navigate complex environments

MIT researchers have developed an ultra-low-power chip that enables tiny robots to create detailed 3D maps and navigate complex environments while consuming just 6 milliwatts of power. This breakthrough could expand the capabilities of drones, inspection robots, and augmented reality devices.

Joe Jacob

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MIT robot
Image: Zamani Sahudi/Pexels

Researchers at the Massachusetts Institute of Technology (MIT) have developed a new ultra-efficient chip that enables tiny autonomous robots to generate detailed 3D maps of their surroundings in real time while consuming only a fraction of the power required by existing systems.

The new MIT robot navigation chip, called Gleanmer, could help small drones and robots safely navigate complex environments, from industrial heating and ventilation systems to confined inspection spaces where battery life and computing resources are limited.

According to the researchers, the chip consumes just 6 milliwatts of power—roughly the same amount needed to run a single LED—while constructing detailed 3D maps for navigation.

The findings were recently presented at the IEEE Very Large-Scale Integrated Circuits Symposium.

Designed for battery-powered robots

Autonomous robots rely on 3D maps to understand their surroundings and avoid obstacles. However, generating these maps typically requires significant computing power and memory, making the process difficult for small, battery-powered devices.

The MIT team tackled this challenge by combining a highly efficient mapping algorithm with custom-designed hardware that minimizes memory usage and energy consumption.

“This paper showcases a key example of how you can leverage co-design of the algorithm and hardware to really push energy efficiency,” Vivienne Sze, professor in MIT’s Department of Electrical Engineering and Computer Science and senior author of the study, said in a media statement.

“While there has been a lot of work looking into compact 3D maps, what stands out about this work is that it also ensures that the process to generate those maps is as efficient as possible. Our chip allows you to store very large maps in a very small space, and do it in a very energy efficient manner,” she added.

Replacing cubes with ‘Gaussian blobs’

Traditional mapping systems represent environments using millions of cube-shaped units known as voxels. These structures require substantial memory and processing power.

Instead, the MIT researchers employed a technique that represents objects using flexible ellipsoid-shaped structures known as Gaussians.

Because these Gaussian representations can adapt to the shape of real-world objects more efficiently, the system requires far less memory than conventional approaches while still preserving detailed information about obstacles and free space.

The chip uses a mapping algorithm developed by the researchers called GMMap, which can generate accurate 3D maps from depth images in a single pass, eliminating the need to repeatedly process and store large image datasets.

“At any point in time, we only need to store a few pixels in memory, which significantly reduces the memory footprint our algorithm requires,” co-lead author Peter Zhi Xuan Li said.

Improving efficiency through hardware-software co-design

As robots move through an environment, they often observe the same object from multiple viewpoints, creating overlapping representations that can increase map size.

To address this, the researchers developed a technique that merges overlapping Gaussian representations directly, without revisiting the original image data. This further reduces memory requirements and power consumption.

The chip also keeps frequently used map data in small on-chip memory units located close to the processing hardware, reducing the need to access more energy-intensive external storage.

“By having a dedicated memory that just stores the objects you’ve seen in the previous few frames, you can access the data much more efficiently,” co-lead author Zih-Sing Fu said.

Potential uses beyond robotics

The researchers tested the chip using a range of existing 3D environments and live data streams from an iPhone camera. In these experiments, Gleanmer generated detailed maps in real time while consuming only about 2.5% of the power required by the best existing map-construction chips.

The team believes the technology could be useful not only for autonomous robots and drones but also for lightweight augmented reality headsets, particularly in applications such as medical training, repair work, and industrial assembly.

“We reduce the memory consumption by making sure the algorithm is efficient. Then we accelerate the workload that is performed by that efficient algorithm, so in the end, our chip is as efficient as possible,” Li said.

Researchers now plan to further improve the technology by bringing processing components closer to sensors and exploring additional applications, including AI systems that need to analyse complex engineering schematics.

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