Time Travel: Can We Reach the Future—and Ever Come Back?

A King Who Returned to Another Age

Imagine this.

You leave home for what feels like a short visit…

…and when you come back, millions of years have passed.

Many Yugas back, the Śrīmad Bhāgavatam narrates a story...

There was a king named Kakudmī.

He had a daughter, Revatī.

Like any deeply concerned father, Kakudmī had one important concern—the future of his daughter and finding the right husband for her.

So he thought:

“Why not ask Brahmā, the creator, himself?”

Kakudmī took Revatī with him and travelled to Brahmaloka.

When they arrived, Brahmā was listening to a celestial musical performance.

So Kakudmī waited.

After the music ended, Kakudmī approached Brahmā and explained why he had come.

He even mentioned the men he was considering for Revatī.

Brahmā smiled.

What he told Kakudmī next was completely unexpected.

In effect, Brahmā told him:

“The men you came to ask me about for Revatī? They are no longer there.

Not only them—their children, their grandchildren, and many generations after them have already lived and passed away.

The world you knew has moved far ahead in time.”

Kakudmī was stunned.

For him, it seemed that only a short time had passed in Brahmaloka.

But back on Earth, twenty-seven catur-yugas had already passed—more than 116 million years in traditional Purāṇic chronology.

Think about that.

Kakudmī had gone looking for his daughter’s future.

Instead, he returned to find that the world he knew had become the distant past.

This is not an Indianized Interstellar story; it comes from the Hindu Purāṇic tradition.

Kakudmī had travelled to Brahmaloka with one simple purpose:

to find the right husband for Revatī and secure a good future for his daughter.

But his journey opened a much bigger mystery.

For Kakudmī, only a short time seemed to have passed.

For Earth, ages had passed.

And suddenly, the question was no longer only:

“Who will Revatī marry?”

A much bigger question appeared:

“Can two observers really experience different amounts of time?”

And once Kakudmī asks that question, many more follow us.

Can we see the past?

Can we travel into the future?

Can speed or gravity change how much time we experience?

Can quantum physics tell us anything about the future?

And if we can move forward in time…

Can we ever come back?

This is where modern physics enters Kakudmī’s journey.

Einstein’s theory of relativity showed that different observers can indeed experience different amounts of elapsed time, depending on their motion and gravitational conditions.

Kakudmī began with one father’s concern: the future of his daughter.

But that concern was about to take him into a much bigger search—

the mystery of time itself.

And that is where our journey into the science of time travel begins.

Before Kakudmī Travels Through Time, Let Him Look Back

Kakudmī wants to know Revatī’s future.

But before asking whether the universe can show him something that has not happened yet, let him first understand something easier:

Can the universe show him something that has already happened, the past?

Imagine, as a simple thought experiment, that Kakudmī is standing not in Brahmaloka, but on Mars, while Revatī remains on Earth. Give him an extraordinarily powerful telescope so that he can observe her.

When Earth and Mars are near their closest distance, they can be roughly 3 light-minutes apart.

Imagine Kakudmī is on Mars, looking toward Earth.

At 9:00 AM, Kakudmī receives light from Earth.

But that light did not leave Earth at 9:00 AM. It has been travelling through space for about three minutes.

So the light reaching Kakudmī at 9:00 AM actually left Earth at around 8:57 AM.

Suppose Revatī raised her hand at 8:57 AM.

What does Kakudmī see at 9:00 AM?

He sees Revatī raising her hand—the Revatī of 8:57 AM.

Meanwhile, Revatī on Earth has already continued three minutes further into her life.

So Kakudmī is not seeing Revatī as she is at 9:00 AM.

He is seeing Revatī as she was three minutes ago.

Kakudmī has not travelled into the past.

The light carrying information from Revatī’s past has travelled to him.

Kakudmī himself has not travelled into the past.

Instead, information from the past has travelled to him.

Now let us take the thought experiment farther.

Instead of imagining Kakudmī physically travelling outward and somehow overtaking old light—which he cannot do—imagine placing him at increasingly greater distances from Earth.

The farther away his observing location is, the older the Earthlight reaching him will be.

Using the planets’ approximate closest light-travel times as separate examples:

• From Jupiter, Kakudmī could receive Earthlight roughly 33 minutes old.

• From Saturn, more than an hour old.

• From Uranus, more than two hours old.

• From Neptune, roughly four hours old.

Now imagine Kakudmī were already somewhere far beyond our Solar System.

At a location 100 light-years from Earth, the Earthlight reaching him would have left Earth about 100 years earlier.

And if Kakudmī could somehow observe Earth from the distance of the Andromeda Galaxy, roughly 2.5 million light-years away, the Earthlight arriving there would have begun its journey about 2.5 million years earlier.

The practical challenge of actually resolving Revatī—or even detailed features on Earth—from such enormous distances would be extraordinary. But the underlying principle remains the same:

Light takes time to travel.

So the farther across space Kakudmī looks, the farther back in time the information he receives comes from.

That gives us first important lesson:

The farther across space you look, the farther into the past you see.

But Kakudmī must be careful.

He still has not travelled through time.

So far, nothing strange has happened to time itself.

He is simply receiving older information because light takes time to cross space.

And now Kakudmī faces a deeper question.

He can see an older Revatī because her light takes time to reach him.

But Revatī has continued living her life on Earth during that journey of light.

So Kakudmī wonders:

“If the Revatī I can see is from the past, what is Revatī doing ‘NOW'?”

And if Kakudmī and Revatī are far apart—and moving differently—

“Do both of us even have to agree on what ‘now’ means?”

That question takes Kakudmī beyond simple light-travel delay and into one of Einstein’s deeper ideas:

the relativity of simultaneity.

Then What Is “Now” for Kakudmī?

Kakudmī has just discovered that from far away, he can see an older Revatī.

So he asks a simple question:

“Then what is happening on Earth right now?”

At first, that sounds easy.

We normally imagine one universal clock.

Earth has a “now.”

Mars has the same “now.”

And everywhere in the universe shares the same present moment.

But Einstein showed that reality is not that simple.

Kakudmī already knows that distant events reach him late because light takes time to travel.

But relativity introduces a deeper idea.

For observers moving relative to one another, there is no single universal definition of simultaneity for widely separated events.

Two observers can disagree about whether distant events happened at the same time.

This is called the relativity of simultaneity.

So Kakudmī’s question—

“What is happening everywhere right now?”

—does not have one absolute answer that every observer in the universe must agree on.

And this leads Kakudmī to an even bigger question:

If “now” itself depends on the observer, can Kakudmī and Revatī actually experience different amounts of time?

Einstein’s answer is:

Yes.

Einstein Gives Kakudmī a Spacecraft

Kakudmī is still trying to understand Revatī’s future.

After learning that there is no simple universal “now,” he asks a bigger question:

“Can Revatī and I actually experience different amounts of time?”

And if they can…

could he travel far enough into Revatī’s future to see what happens?

To find out, let us replace his journey to Brahmaloka with a simple thought experiment.

Imagine Kakudmī and Revatī are on Earth with two perfectly synchronized clocks.

Revatī stays on Earth.

Kakudmī boards a spacecraft travelling extremely close to the speed of light.

He travels through space, turns around, and eventually returns to Earth.

For Kakudmī, everything feels completely normal during the journey.

His heartbeat feels normal.

His clock ticks normally.

Kakudmī never feels his own time slowing down.

But when he returns to Earth, something surprising happens.

Kakudmī’s clock and Revatī’s clock no longer show the same amount of elapsed time.

As an extreme hypothetical example, suppose Kakudmī experiences only:

5 years.

But on Earth, where Revatī remained:

50 years have passed.

Kakudmī returns only five years older.

But Revatī—and Earth—have aged fifty years.

In other words, Kakudmī has experienced only five years of his own life, while returning to an Earth that is fifty years beyond the day he left.

He has aged 45 years less than he would have if he had stayed on Earth with Revatī.

This is Kakudmī and Revatī’s version of the famous twin-paradox thought experiment from

Einstein’s special theory of relativity.

The idea is simple:

Kakudmī and Revatī started together.

They followed very different journeys through spacetime.

And when they met again, they had experienced different amounts of elapsed time.

This is what physicists mean when they describe relativistic time dilation as a form of forward time travel.

Kakudmī has not jumped instantly into the future.

He has simply experienced less time while much more time passed on Earth.

And suddenly, Kakudmī’s ancient story has a modern scientific echo:

Leave → experience less time → return → discover that much more time has passed elsewhere.

For Kakudmī, this changes everything.

If speed can allow him to experience less time while Revatī and Earth move much further into the future, then perhaps he really can travel toward Revatī’s future.

So Kakudmī now knows that motion can change how much elapsed time he experiences relative to Revatī.

But Einstein gives him another route as well:

Gravity.

Gravity Gives Kakudmī Another Route

Kakudmī now knows that travelling extremely fast can allow him to experience less time while much more time passes for Revatī on Earth.

But does he really need a spacecraft travelling close to the speed of light?

Einstein gives him another route:

gravity.

Now imagine Kakudmī does not travel extremely fast.

Instead, he spends time closer to a very massive object, where the gravitational effect is much stronger, while Revatī remains farther away.

Their clocks would no longer accumulate exactly the same amount of elapsed time.

A clock deeper in a gravitational field ticks more slowly relative to a clock farther away.

This is called gravitational time dilation.

And this is not just an idea on paper.

In 2022, JILA/NIST researchers used extremely precise atomic clocks to measure gravitational time dilation across a vertical distance of only about one millimetre.

Think about that.

Two clocks separated by roughly the thickness of a pencil tip can tick at slightly different rates because of gravity.

The difference is incredibly tiny—far too small for us to notice in everyday life—but modern atomic clocks are precise enough to measure it.

So Kakudmī now discovers a second way in which he and Revatī could experience different amounts of time.

Motion can make their clocks accumulate different amounts of time.

Gravity can make their clocks accumulate different amounts of time.

Under normal conditions on Earth, these differences are extremely small.

But in much more extreme gravitational environments, the effect could become far greater.

For Kakudmī, this opens another possibility.

A near-light-speed spacecraft may not be the only way for him to experience less time while Revatī and Earth move much further into the future.

Gravity could do it too.

But one extraordinary atomic-clock experiment is not enough to satisfy Kakudmī.

He wants to know:

“Has relativistic time dilation been measured in other real-world situations too?”

The answer is:

Yes.

Kakudmī’s Time Travel Is No Longer Pure Imagination

Kakudmī has seen that even a tiny difference in height can produce a measurable difference in elapsed time.

But what about motion?

Has Einstein’s prediction been tested outside such precision laboratory experiments?

Again, the answer is:

Yes.

In 1971, physicists Joseph Hafele and Richard Keating carried atomic clocks aboard commercial aircraft and flew them around the world.

Other atomic clocks remained on the ground.

When the travelling clocks returned, they no longer showed exactly the same elapsed time as the clocks that had stayed behind.

Their motion and different gravitational conditions affected how much time the clocks accumulated, in agreement with the predictions of relativity.

High-speed particles provide an even more dramatic example.

Scientists have studied muons travelling extremely close to the speed of light.

A muon has a lifetime of only about 2.2 microseconds in its own rest frame.

But when muons move at relativistic speeds, observers in the laboratory measure them surviving much longer—exactly the kind of effect predicted by special-relativistic time dilation.

And relativity is not limited to experiments in laboratories.

GPS satellites carry atomic clocks.

Because the satellites are moving rapidly and are also in a different gravitational environment from clocks on Earth, relativity affects their timing.

Those relativistic effects must be accounted for in precise satellite navigation and timekeeping.

For Kakudmī, the message is now clear:

Different amounts of elapsed time are not science fiction.

Relativistic time dilation is measurable physics.

The only missing piece is scale.

With aircraft or clocks at different heights, the differences are extremely small.

But at speeds extremely close to the speed of light—or in sufficiently extreme gravitational conditions—the difference could, in principle, become years or even decades.

So Kakudmī asks the question that matters most to him:

“Could I really travel far enough into Earth’s future to discover what happens to Revatī?”

Relativity answers:

Yes—in principle.

But Kakudmī’s original purpose was never simply to travel into the future.

He wanted to understand Revatī’s future—and find the right husband for her.

So an even more tempting question appears:

“If I can travel toward Revatī’s future, can I somehow see her future husband before that future actually happens?”

And that takes Kakudmī to the next mystery.

But Can Kakudmī See Revatī’s Future Before It Happens?

Kakudmī now comes back to the question that started his entire journey:

What will Revatī’s future be—and who will she marry?

He already knows that light travelling across space can bring him information from Revatī’s past.

So he wonders:

“If I can see Revatī’s past, can I somehow see her future husband too?”

According to established physics:

No known method allows him to do that.

Why?

Revatī’s past has already happened.

Light carrying information about those past events can travel through space and eventually reach a distant observer.

But Revatī’s future marriage is a different matter.

No known physical process allows information from that future event to reach Kakudmī before the event itself occurs.

The distinction is simple:

The past has already produced information that can travel through space.

The future cannot send Kakudmī information before it happens.

So if Kakudmī were observing Earth from a distant location, he could receive older Earthlight and see information about Revatī’s past.

But there is no known place in space where he can simply look toward Earth and see Revatī’s future husband before that future occurs.

Kakudmī, however, is still not ready to give up.

If he cannot see Revatī’s future...

perhaps he can at least calculate what might happen.

And that takes him to another strange world of modern physics:

quantum mechanics.

Kakudmī Asks Quantum Mechanics

Kakudmī is still searching for an answer about Revatī’s future.

If he cannot see her future husband in advance, he asks:

“Can I at least calculate the probability of who it might be?”

Quantum mechanics gives him an interesting—but very limited—answer.

Quantum mechanics can assign probabilities to possible outcomes of well-defined quantum measurements.

For a very simple analogy, imagine Kakudmī considering three possible outcomes:

Candidate A — 50%

Candidate B — 30%

Candidate C — 20%

But this is only an analogy.

Quantum mechanics cannot simply calculate:

“There is a 50% probability that Revatī will marry Candidate A.”

A marriage depends on an enormous chain of events—people, decisions, circumstances, interactions and choices.

It is not a single quantum measurement for which physics can simply produce three percentages.

The real lesson for Kakudmī is more limited.

Quantum mechanics can answer questions such as:

“What outcomes are possible for this quantum experiment?”

and:

“What probability does the theory assign to each measurement outcome?”

But it cannot tell Kakudmī:

“This is definitely the person Revatī will marry in the future.”

A probability is not a picture from tomorrow.

And a quantum computer is not a telescope into the future.

It can perform certain kinds of computation using quantum mechanics, but it does not give us access to information from future events before they happen.

So Kakudmī learns another important lesson:

Quantum physics can describe probabilities for quantum outcomes, but it does not let him look ahead and discover Revatī’s actual future.

That brings him back to the one path modern physics does allow.

If he cannot see Revatī’s future before it happens...

perhaps he can travel forward and reach that future himself.

But then Kakudmī faces an even bigger problem:

“If I reach Revatī’s future, can I ever return to the time I left?”

Kakudmī Can Go Forward. Can He Come Back?

Kakudmī now knows that relativity gives him a way, at least in principle, to travel far into Earth’s future while experiencing much less time himself.

He could travel extremely close to the speed of light.

Or he could spend time under very different gravitational conditions.

In either case, Kakudmī could experience less elapsed time while much more time passes for Revatī and Earth.

Suppose Kakudmī experiences only five years, while fifty years pass on Earth.

When he returns, he reaches an Earth that is fifty years beyond the day he left, even though he himself has aged by only five years.

For Kakudmī, that is a real route forward in time in the relativistic sense.

Perhaps he could finally reach Revatī’s future and discover what happened.

But the moment he arrives, a completely different question appears:

“Now that I have reached Revatī’s future, how do I return to the time I originally left?”

Ordinary time dilation cannot take him back.

Kakudmī’s own clock always moves forward.

Travelling faster can change how much time he experiences compared with Revatī.

Gravity can also change how much time he experiences compared with Revatī.

But neither allows him to simply reverse the process and return to yesterday.

That distinction is crucial:

Reaching the future is one problem.

Returning to the past is a completely different problem.

To return to an earlier time, Kakudmī would need something far stranger than ordinary relativistic time dilation.

He would need spacetime itself to provide a path connecting not only different places, but potentially different times.

Does modern physics contain any such possibility?

Mathematically, there is one fascinating idea.

A shortcut through spacetime that could connect two distant regions—and, under certain theoretical conditions, perhaps even different external times.

And that brings Kakudmī to one of the most famous ideas in theoretical physics:

the wormhole.

Kakudmī Meets the Wormhole

Kakudmī now has one goal:

Find a road back to the time he left.

Relativistic time dilation may allow him to travel into Revatī’s future.

But it cannot bring him back to his own past.

So Kakudmī now needs something much stranger.

Imagine two distant regions of spacetime connected by a shortcut—a kind of tunnel through spacetime.

That hypothetical structure is called a wormhole.

Normally, Kakudmī would have to travel the enormous distance between those two places.

A wormhole, if one existed and were traversable, could theoretically connect them through a much shorter path.

But Kakudmī is not simply looking for a shortcut through space.

He is looking for a shortcut through time.

And this is where the idea becomes even stranger.

Suppose a traversable wormhole has two openings, called mouths.

Imagine one mouth remains relatively stationary while the other is taken on a journey at extremely high speed and later brought back near the first.

Because of relativistic time dilation, the moving mouth could experience less elapsed time than the stationary one.

The two mouths could then become offset in time.

Their clocks would no longer agree.

Now suppose Kakudmī enters one mouth.

Under the right theoretical conditions, he could emerge from the other mouth at a different external time from the one at which he entered.

Suddenly, the wormhole is no longer only a shortcut between two places.

It could become a shortcut between two times.

This possibility was seriously studied by physicists Michael Morris, Kip Thorne and Ulvi Yurtsever.

Their work showed that, under certain mathematical assumptions, a traversable wormhole could in principle be converted into a time machine.

For Kakudmī, this sounds extraordinary.

Perhaps he has finally found the road he has been searching for—

a way to reach Revatī’s future and then find a path back toward the time he left.

But there is one enormous problem.

No one has ever found a confirmed traversable wormhole.

Can such a wormhole actually exist?

We do not know.

Can it remain open and stable?

Unknown.

Can the unusual physical conditions that theoretical traversable wormholes appear to require exist on a useful scale?

Unknown.

Can a human—or anything comparable—safely travel through one?

Unknown.

So Kakudmī has found something remarkable:

a possible road back in the mathematics, but not a road we know exists in the real universe.

And there is another problem hiding inside the idea itself.

If Kakudmī could use a time-shifted wormhole to return to an earlier event, his journey could form a path through spacetime that eventually loops back toward its own past.

Physicists have a name for such a path:

a closed timelike curve.

And that takes Kakudmī to an even deeper question:

Can spacetime itself really contain a road that leads back into the past?

Kakudmī Finds a Stranger Road: Closed Timelike Curves

The wormhole has given Kakudmī a possible mathematical road back, but not a proven one.

So he asks a deeper question:

“What if spacetime itself contains a path that leads back into the past?”

General relativity contains such a theoretical possibility.

It is called a closed timelike curve, or CTC.

Imagine Kakudmī always moving forward according to his own clock.

His heartbeat moves forward.

His clock keeps ticking forward.

He never feels time running backward.

But now imagine that spacetime itself is shaped in such a way that the path he follows eventually loops back to an earlier event.

Kakudmī keeps moving forward along the road...

but the road itself brings him back toward his own past.

That is the strange idea behind a closed timelike curve.

Certain mathematical solutions of Einstein’s equations allow such paths.

One famous example is Kurt Gödel’s rotating-universe solution, proposed in 1949, which contains closed timelike curves. 

Other theoretical models involving particular rotating spacetimes, specially arranged cosmic strings, or traversable wormholes have also been studied for similar possibilities. 

But Kakudmī quickly learns an important lesson:

A path can exist in the mathematics without existing in the real universe.

Gödel’s model, for example, describes a very unusual rotating universe and does not represent the universe we actually observe. Other proposed CTC-producing scenarios also require highly idealized or physically uncertain conditions. 

So far:

No experimentally verified closed timelike curve has ever been found.

No traveller has ever been shown to use one to reach the past.

For Kakudmī, the road remains mathematical—not physical.

But suppose, just for a moment, that he somehow found such a path.

Suppose he followed it back to a time before he originally began his journey.

Then Kakudmī would face an even bigger problem.

Not a problem of distance.

Not a problem of speed.

But a problem of cause and effect.

Because what happens if Kakudmī reaches his own past...

and changes the very event that caused him to travel there in the first place?

That takes him directly to one of time travel’s most famous puzzles:

The grandfather paradox.

Kakudmī Meets the Grandfather Paradox

Suppose Kakudmī succeeds.

He travels back to a time before he originally left for Brahmaloka.

Now imagine he meets his younger self and says:

“Do not make the journey.”

His younger self listens.

Kakudmī never travels to Brahmaloka.

But then a problem appears.

If Kakudmī never made the original journey...

who came back from the future to stop him?

This is Kakudmī’s version of the famous grandfather paradox.

Backward time travel creates serious questions about causality—cause and effect.

Physicists and philosophers have proposed possible solutions.

Perhaps history must always remain self-consistent.

Perhaps a traveller can enter the past but cannot change it in a way that creates a contradiction.

Some speculative quantum interpretations also discuss branching histories.

But none of these ideas has been experimentally demonstrated as the working principle of a real time machine.

So even if Kakudmī finds a mathematical road into the past, causality may stand in his way.

And perhaps that is not accidental.

Perhaps nature itself prevents the road from opening.

Perhaps Nature Stops Kakudmī at the Door

Kakudmī has followed every possible road he can find.

Relativity gives him a path forward into Revatī’s future.

Wormholes and closed time like curves seem to offer mathematical possibilities for returning to the past.

But every road back leads to uncertainty, causality problems, and paradoxes.

And this is where Stephen Hawking enters Kakudmī’s journey.

In 1992, Hawking proposed what he called the Chronology Protection Conjecture. 

The idea is fascinating:

Perhaps the laws of physics themselves prevent a usable time machine from ever forming.

As spacetime approaches conditions in which closed timelike curves might appear, quantum effects could become so significant that they disrupt those conditions before a path into the past can form. This possibility has been studied extensively, but it has not been established as a universal mechanism. 

In simple words:

Kakudmī gets closer and closer to opening a road back to his past...

perhaps even hoping to return to the time before his search for Revatī’s future began...

but nature may close the door before he can enter.

That is a powerful idea.

But it is important to remember:

it is still a conjecture—not a proven law of nature.

Different theoretical studies of quantum fields near would-be chronology horizons have produced complicated results, and physics still does not have a complete experimentally confirmed theory of quantum gravity capable of giving us the final answer. 

So Kakudmī has finally reached the edge of what modern physics can currently tell him.

His journey forward into the future rests on experimentally tested relativity and time dilation.

But his journey back into his own past remains only a theoretical possibility.

No wormhole time machine has been demonstrated.

No closed timelike curve has been experimentally discovered.

And no traveller has ever been shown to return to the past.

Kakudmī began this journey wanting to discover Revatī’s future.

Modern physics has shown him that he might, in principle, travel forward and reach that future himself.

But if he then asks:

“Can I come back?”

physics still has no demonstrated road home.

So What Has Kakudmī Learned About Time Travel?

Kakudmī began his journey with one simple purpose:

to secure the best possible future for Revatī and find the right husband for her.

But that one concern took him far beyond the question of marriage.

It took him through light, relativity, gravity, quantum mechanics, wormholes, causality—and finally to the limits of what modern physics can tell us.

Now Kakudmī can finally separate what science has measured and established from what remains theoretical or unknown.

Can Kakudmī see Revatī’s past?

Yes.

From a distant location, Kakudmī can receive light that left Earth earlier.

The farther away the observer is, the older the Earthlight reaching that location will be.

But Kakudmī has not travelled into the past.

He is receiving information from the past.

Can Kakudmī experience less time than Revatī?

Yes.

Special and general relativity allow different observers following different paths through spacetime—or experiencing different gravitational conditions—to accumulate different amounts of elapsed time.

The underlying effects of relativistic time dilation have been experimentally measured.

Can Kakudmī travel into Earth’s future?

Yes—in the relativistic sense, in principle.

If Kakudmī could travel sufficiently close to the speed of light, much more time could pass on Earth than for him.

He could return having aged far less than Revatī and find himself much farther into Earth’s future.

The physics behind this effect is experimentally established, even though sending a human decades or centuries into the future this way is far beyond our present technological capability.

Can gravity also take Kakudmī farther into Earth’s future?

Yes—in the relativistic sense.

Different gravitational conditions can cause clocks to accumulate different amounts of elapsed time.

A clock deeper in a gravitational field ticks more slowly relative to one farther away.

Gravitational time dilation has also been experimentally measured.

Can quantum mechanics show Kakudmī Revatī’s actual future before it happens?

No demonstrated method exists.

Quantum mechanics can assign probabilities to possible outcomes of quantum measurements.

But it cannot show Kakudmī a confirmed picture of Revatī’s future husband before that future event occurs.

A probability is not a photograph from tomorrow.

Can Kakudmī return to his own past?

No physically demonstrated method is known.

Wormholes and closed timelike curves appear in theoretical and mathematical discussions of general relativity.

But no traversable wormhole time machine has been demonstrated.

No closed timelike curve has been experimentally discovered.

And no traveller has ever been shown to return to the past.

So Kakudmī has discovered an important difference:

The road forward has experimentally tested physics behind it.

The road backward remains theoretical and unproven.

And that brings Kakudmī back to where everything began.

And So We Return to Brahmaloka

Let us return one last time to where this journey began.

Kakudmī stands before Brahmā, with Revatī beside him.

He had travelled there with one simple concern:

the future of his daughter—and finding the right husband for her.

Instead, he encountered a much bigger mystery.

For Kakudmī, only a short time seemed to have passed.

But on Earth, ages had gone by.

That moment opened a question that followed him through the entire journey:

Does everyone experience time in the same way?

Modern physics tells us:

No.

Light lets us receive information from the past.Relativity shows that motion and gravity can make different observers experience different amounts of elapsed time.Quantum mechanics describes probabilities—but not a photograph of tomorrow.

And when Kakudmī finally asks:

“If I can travel into the future, can I come back?”

the certainty ends.

Wormholes and closed timelike curves appear in mathematics.Causality creates paradoxes.And Stephen Hawking’s Chronology Protection Conjecture raises the possibility that nature itself may prevent a usable road into the past.

So modern physics leaves Kakudmī with a fascinating answer:

Forward time travel has a foundation in experimentally tested relativity.

Backward time travel remains unproven.

Kakudmī began by searching for Revatī’s future.

But somewhere along the way, he began searching for something much greater:

the nature of time itself.

And perhaps that is where the story becomes personal for all of us.

We spend our lives thinking about the past, worrying about the future, and often forgetting that the only moment we can actually live is the one passing through us now.

Physics tells us that time is stranger than our everyday experience suggests.

But perhaps time also teaches us something simpler:

We may look into the past. We may dream about the future. But life is always lived forward.

So if Kakudmī could ask modern physics one final question—

“Can I travel through time?”

The answer today would be:

Into the future? In principle, yes.

Back into the past? We still do not know.

Kakudmī began his journey looking for the right future for his daughter.

He ended by discovering that the greatest mystery was not what the future holds—

but what time itself really is.

And perhaps that mystery is why we keep looking backward, dreaming forward, and trying to understand the brief moment we call now.

Signed off from my past, arriving in your present, for someone reading in the future,

Prashant Penumatsa

#TimeTravel #Physics #Relativity #SpaceTime #QuantumPhysics #StephenHawking #ScienceCommunication #IndianKnowledgeSystems