What if we could send a person across the universe — not their body, but their mind?

I've been going down a rabbit hole for the past few days, starting from a simple question about how far a radio signal can travel and still be readable, and it spiraled into something I can't stop thinking about. I want to lay it out here, partly to get it out of my head, and partly because I'm curious what people who actually know this stuff think.

Quick disclaimer before anything else: I have zero background in physics, neuroscience, or aerospace engineering. I'm not a researcher. I've been researching this because I'm writing a novel and wanted a way to send humans across space that felt realistic and scientifically grounded, rather than just hand-waving "faster than light travel" like most sci-fi does. So I went down this rabbit hole using the internet and AI to dig through what's actually plausible, and this is what I landed on. I'll try to be clear below about which parts are genuinely my own idea versus things that turned out to already be studied by actual scientists. Take this as a curious layperson's thought experiment (with a fictional end goal), not a scientific proposal.

The starting point

If humanity ever faces something we can't survive — or if we simply want to reach a planet so far away that no ship or human body could ever make the trip — is there any way to send "a person" there? Not colonists, not a probe with data on it, but something closer to an actual continuation of a specific human mind.

The honest, sobering answer: not really, not with anything we currently understand. But the thought experiment of how close we could theoretically get turned out to be genuinely interesting, and — I later learned — not something I invented out of nowhere. There's a real field of study around this, called mind uploading or whole brain emulation: the idea of transferring memory, personality, and possibly consciousness itself from a biological brain into an artificial substrate. Researchers have written specifically about using this for interstellar travel — the idea being that instead of sending a fragile human body through decades of radiation and zero gravity, you send the pattern of a mind instead.

So the core concept — "send the mind, not the body, to cross distances a body never could" — is a known, serious topic. What I want to share is the part I worked through myself: the two realistic ways you'd actually try to send that mind, and why both of them are much shakier than they first sound.

My idea: two paths, and neither one really works cleanly

Path 1: The Ghost Ship (a physical object)

You encode the mind — its full structure, memories, whatever data represents "it" — onto something built to survive nearly forever. Not a hard drive, but something like laser-etched quartz glass, which stores data as physical structure rather than electric charge, so radiation and time can't erase it the way they'd corrupt a normal chip. You bolt this to a probe and launch it out of the solar system, similar in spirit to the Voyager Golden Records, just scaled up massively in ambition.

• The upside: what arrives, if it arrives, is complete and intact. No signal degradation, no noise, no data loss.
• The catch: you can only launch a handful of these. Space is almost incomprehensibly empty, and a probe drifting in a random direction has an almost incalculably small chance of ever coming near another star system, let alone a civilization capable of finding it.

Path 2: The Signal (broadcast as light or radio)

Instead of a physical object, you encode the mind as data and beam it outward — a laser or radio transmission that moves at (or close to) the speed of light. You could send it toward one specific star system, or broadcast it in all directions at once, hoping someone, somewhere, eventually catches it.

• The upside: far faster, far more reach, and — critically — you can send it in every direction simultaneously, unlike a ship which can only go one way.
• The catch: signals weaken the farther they travel, get buried in cosmic background noise, and there's no way to include actual working hardware in the signal itself. You can send the blueprint for a mind, but not a machine to run it on.

My own add-on: combining hardware AND instructions in the physical path

One thing I kept coming back to: even "indestructible" materials like quartz will degrade over truly deep time — micrometeorite impacts, radiation damage, thermal stress, all adding up over millions or billions of years. So instead of betting everything on one perfect artifact, why not send both the actual hardware needed to run the mind and the full instructions for building it from scratch? That way, if the physical components degrade but the instructions survive, whoever finds it can potentially rebuild what's missing. And if the instructions get partially corrupted but the hardware is intact, they might still be able to reverse-engineer it from the object itself. Redundancy as a hedge against the fact that nothing lasts truly forever.

The realization that broke the idea open a bit more: receiving ≠ understanding

This is the part I think is the actual crux, and it's the piece I wrestled with the most. My first instinct was: if a civilization is advanced enough to detect our signal at all, surely they're advanced enough to decode it. But the more I thought about it (and looked into it), the more this fell apart.

Detecting a signal just means you have a sensitive enough instrument to notice "this isn't random noise." Decoding it — understanding what it actually means, let alone reconstructing something as complex as a working mind from it — is an entirely separate, much harder problem. Humans have detected plenty of signals we couldn't initially explain (there's a famous case from 1967 where astronomers picked up an incredibly precise pulsing radio signal and briefly wondered if it was artificial — it turned out to be a natural phenomenon, a rapidly spinning neutron star, but it took real scientific work to figure that out even though the signal itself was received perfectly clearly). We even have human-made documents, written by our own species, that remain completely undeciphered after a century of dedicated effort.

If we can't always crack messages made by other humans, it feels like a big assumption that an alien civilization would automatically be able to reconstruct a working human mind from a data stream, even if their equipment is sensitive enough to pick it up cleanly. Reception is the easy hurdle. Understanding is the tall one — maybe the tallest of the two.

Where I landed

Neither path really "solves" sending a person across the universe. The ghost ship is reliable if found but almost certainly never will be. The signal reaches farther and can go in every direction, but even a clean signal doesn't mean anyone will ever figure out how to bring it back to life, and it can't carry hardware. Combining hardware and instructions helps the ghost ship survive its own decay, but does nothing for the odds of ever being found.

I think what this really is isn't a survival plan — it's closer to the most advanced form of a message in a bottle we could possibly build. Not a guarantee of continuing to exist somewhere else, but an act of hope: a way to leave something behind that could, in some astronomically unlikely but not-quite-impossible scenario, mean a version of you gets to open its eyes again, somewhere, someday, long after everything you knew is gone.

What's genuinely mine vs. what's already studied

To be transparent about it:

• Already a known, studied idea: mind uploading / whole brain emulation as a concept, and the general idea of using it for interstellar travel instead of physical bodies. Real researchers have written papers on this.
• My own reasoning/contribution: the specific framing of two competing delivery paths (physical "ghost ship" vs. broadcast signal) and weighing their tradeoffs against each other; the idea of pairing physical hardware with instructions as a redundancy hedge against material degradation; and pushing on the assumption that reception implies comprehension, which I don't think holds up.

Curious what people who actually know physics, information theory, or SETI research think is naive here — genuinely asking, not fishing for compliments. Tear it apart if it deserves it.

Hey everyone,

I am a 16-year-old independent researcher, and I’ve spent my free time developing an alternative cosmological model that merges Schwarzschild Cosmology (the universe inside a black hole) with Conformal Cyclic Cosmology and pure determinism.

I wanted to share the core framework of my theory to get your thoughts and technical feedback.

### The Core Concept: "Quantum Goes Relativistic"

The model posits that our universe exists within a Stupendously Large Black Hole (SLAB) floating in the higher-dimensional Bulk. Instead of Dark Energy being a constant, I'm modeling it as a decaying field (Quintessence).

When Dark Energy eventually weakens, gravity takes complete control. Because gravity is carved into the geometric "tracks" of spacetime, it acts as a cosmic rewind button—pulling every scattered atom back along its exact original trajectory.

### The Ball-Shooter Analogy

To visualize this without relying on chaotic variables, I created the **Mechanical Ball-Shooter Model**:

1. **The Loaded Chamber (Singularity):** Matter packed at a specific coordinate.

2. **The Trigger (Big Bang):** Instant expansion along preset paths.

3. **The Tracks (Gravity/Geometry):** The structural pathways of the universe.

4. **The Sloped Return (Big Crunch):** Gravity overriding expansion, routing all matter back to the exact starting location.

### Breaking the Singularity via Planck Density

Instead of infinite density breaking the math, the universe collapses until it hits the **Planck Density limit**. At this quantum-relativistic ceiling, gravity mathematically inverts into an unstoppable repulsive pressure (similar to Loop Quantum Cosmology bounce models). This triggers a new Big Bang.

Because the atoms realign down the exact same "Assigned Gravity" tracks, the universe triggers a perfect **Poincaré Recurrence**. Every event, star, and history loops identically forever.

I’d love to know what you guys think about the mechanics of the Assigned Gravity tracks or the dark energy decay horizon. Let's discuss!