How Fusion Actually Works
From hydrogen to helium to energy
In Plain English
Fusion is the opposite of nuclear fission. Fission splits heavy atoms apart — that's how conventional nuclear power plants work, breaking uranium into smaller fragments. Fusion does the reverse: you smash light atoms together so hard that they merge into a heavier atom, releasing enormous energy in the process.
It's what powers every star in the universe. Right now, the sun is fusing roughly 600 million tons of hydrogen per second, converting it to helium and flooding the solar system with light and heat. It has been doing this for 4.6 billion years. That's how much energy fusion produces.
The challenge is reproducing this on Earth. Stars cheat — they have immense gravity to squeeze hydrogen together. We don't. Instead, we need to heat hydrogen fuel to extraordinary temperatures — over 100 million degrees Celsius, roughly ten times hotter than the center of the sun — to force the positively charged nuclei close enough together to fuse. At those temperatures, matter becomes plasma, and confining it becomes the central engineering problem. That's why we need magnetic confinement.
The D-T Fusion Reaction
The most studied fusion reaction: Deuterium (heavy hydrogen) collides with Tritium (superheavy hydrogen) to produce Helium-4, a free neutron, and 17.6 million electron-volts of energy. Follow the reaction from left to right.
How It Works
The Coulomb Barrier
Every atomic nucleus carries a positive electric charge. Like charges repel each other — this is a basic law of electromagnetism. When you try to push two hydrogen nuclei together, this electromagnetic repulsion — called the Coulomb barrier — pushes them apart with tremendous force. The closer they get, the stronger the repulsion becomes.
But there's a twist. At extremely short distances — less than a femtometer (10−15 meters) — a different force takes over: the strong nuclear force. This force is about 100 times stronger than electromagnetic repulsion, but it only works at incredibly short range. Once two nuclei get close enough for the strong force to grab them, it snaps them together and fusion happens. The energy released comes from the tiny difference in mass between the reactants and the products — Einstein's famous E=mc².
The entire challenge of fusion energy is getting nuclei past the Coulomb barrier. The only way we know how to do it at scale is with extreme temperature — giving the nuclei enough kinetic energy to smash through the repulsion. At 150 million degrees Celsius, hydrogen nuclei are moving fast enough that a small percentage of collisions succeed. That's fusion.
Aneutronic Fusion: The Holy Grail
The D-T reaction shown in the diagram above produces a high-energy neutron. That's a problem. Neutrons have no electric charge, so magnetic fields can't contain them. They slam into the reactor walls at 14% the speed of light, causing radiation damage, making the reactor structure radioactive over time, and wasting energy as heat in the walls instead of converting it to electricity directly.
But certain fuel combinations produce no neutrons at all. These are called aneutronic reactions. The two most studied are:
Proton-Boron-11 (p-B11)
Hydrogen fuses with Boron-11, producing three helium-4 nuclei and nothing else. No neutrons, no radioactive waste. The energy comes out as charged particles that can be converted directly to electricity.
Helium-3 + Helium-3 (He3-He3)
Two He-3 nuclei fuse to produce He-4 plus two protons. Clean, but He-3 is extremely rare on Earth. Abundant on the Moon's surface, which is why some advocate lunar mining for fusion fuel.
Aneutronic fusion is much harder to achieve — it requires even higher temperatures than D-T fusion. But if you can make it work, you get a reactor that produces no radioactive waste, no neutron radiation, and can convert energy directly to electricity without steam turbines. This is what Robert Bussard's Polywell reactor was designed to achieve — aneutronic p-B11 fusion in a compact device.
Why Tokamaks Aren't the Answer (Maybe)
For decades, most fusion funding has gone to tokamaks — massive, donut-shaped reactors that confine plasma using enormous superconducting magnets. The flagship project, ITER in France, weighs 23,000 tons and will cost over $25 billion. It has been under construction for decades.
The problem with tokamaks isn't that they don't work — they do fuse atoms. The problem is efficiency. A tokamak's beta value (the ratio of plasma pressure to magnetic pressure) is typically around 0.05 — meaning only 5% of the magnetic energy is actually being used to confine plasma. The rest is waste. This forces the reactors to be enormous and enormously expensive.
Alternative designs like Field-Reversed Configuration (FRC) and the Polywell achieve beta values approaching 1.0 — nearly 100% efficiency. The plasma fills most of the reactor volume instead of threading through a thin channel. The result: a reactor that could be room-sized instead of building-sized, and orders of magnitude cheaper to build. Companies like TAE Technologies and Helion Energy are pursuing FRC commercially today.
Learn more: Our Magnetic Confinement 101 guide explains the tokamak vs. FRC comparison in detail, with an interactive side-by-side diagram.
Why This Matters for 4Orbs
Ashton Forbes claims the U.S. Navy has achieved practical, compact nuclear fusion using FRC technology — and that this has been kept classified. If true, it would represent a breakthrough of historic proportions. A working compact fusion reactor would provide energy density orders of magnitude beyond any chemical fuel — enough to power the orb-like devices seen in the MH370 thermal footage, enough to sustain continuous plasma confinement in a device small enough to be airborne.
The physics of fusion connects directly to every major thread in the 4Orbs investigation. Energy independence — a working fusion reactor would make fossil fuels obsolete, threatening trillions of dollars in existing infrastructure and geopolitical power structures. Classified Navy research — Robert Bussard's Polywell program was funded by the Navy and classified after promising results. The Navy has filed patents for "compact fusion reactors" as recently as 2018. Power source — if the orbs are real technology, they need an energy source far beyond batteries or chemical fuel. Only nuclear reactions provide the necessary energy density.
Mainstream vs. Speculative
This site covers both established science and unproven claims. Here's where the line falls for this topic.
Nuclear fusion is well-established physics — it powers every star and has been achieved in thermonuclear weapons and laboratory experiments. ITER is under construction in France. The National Ignition Facility at Lawrence Livermore achieved fusion ignition in December 2022. Aneutronic fusion is theoretically possible and actively researched. None of the fundamental science on this page is controversial.
That the U.S. Navy has achieved practical, compact fusion reactors based on Bussard's Polywell design. That these reactors power advanced craft or orb-like devices. That breakthrough fusion technology has been deliberately suppressed to protect existing energy industries. These claims go well beyond published research and remain unverified.
Key Terms
Nuclear Fusion
The process of combining light atomic nuclei into a heavier nucleus, releasing energy. The opposite of fission (splitting atoms). Powers all stars. Requires extreme temperatures to overcome electromagnetic repulsion between positively charged nuclei.
Coulomb Barrier
The electromagnetic repulsion between two positively charged nuclei that must be overcome for fusion to occur. Named after Charles-Augustin de Coulomb. Overcoming it requires either extreme temperature (kinetic energy) or quantum tunneling at lower energies.
Deuterium-Tritium (D-T)
The most studied fusion fuel combination. Deuterium (1 proton, 1 neutron) and Tritium (1 proton, 2 neutrons) are both hydrogen isotopes. Their fusion produces Helium-4 plus a neutron, releasing 17.6 MeV. The easiest fusion reaction to achieve.
Aneutronic Fusion
Fusion reactions that produce no neutrons. Examples: proton-Boron-11 (p-B11) and He3-He3. Far cleaner than D-T fusion — no neutron radiation, no radioactive waste, direct energy conversion possible. Harder to achieve but vastly more desirable.
Beta (β)
The ratio of plasma pressure to magnetic field pressure in a fusion reactor. A key efficiency metric. Tokamaks: β ≈ 0.05 (5% efficient). FRC: β ≈ 1.0 (near 100%). Higher beta means more compact, cheaper reactors.
Polywell
A compact fusion reactor concept invented by Robert Bussard, using a polyhedral arrangement of magnetic coils to create an FRC-type confinement. Developed under Navy funding (WB series). Designed for aneutronic p-B11 fusion. Bussard claimed breakthrough results before his death in 2007.