Imagine a world where the boundaries of physics, technology, and resources vanish. In this realm, scientists could pursue the most daring and imaginative experiments, pushing the limits of what we understand about the universe. Five physicists share the wildest experiments they would run if there were no constraints—no budget, no technical barriers, no ethical limits. From a particle smasher encircling the moon to an “impossible” laser, these ideas reveal the power of pure imagination in science.
A Particle Smasher Around the Moon
One physicist imagines building a particle accelerator so large it would circle the moon. Current accelerators, like the Large Hadron Collider, span just 27 kilometers. But what if the ring stretched 10,921 kilometers, the moon’s circumference? This colossal machine could smash particles at energies far beyond anything achievable on Earth.
The goal would be to explore new physics beyond the Standard Model, potentially discovering unknown particles or forces. The moon’s low gravity and vacuum environment would reduce interference, allowing cleaner experiments. Challenges would include constructing and maintaining such a structure remotely and managing the immense energy requirements. Still, this experiment would open a new frontier in particle physics.
The “Impossible” Laser
Another scientist dreams of creating a laser that defies current physical limits. This laser would produce a beam so intense it could manipulate matter at the atomic level, enabling direct control over chemical reactions or even altering atomic structures. The laser’s power would surpass anything today’s technology can generate, allowing experiments in quantum control and new states of matter.
Such a device could revolutionize materials science, medicine, and energy. For example, it might enable the creation of materials with properties never seen before or trigger nuclear fusion reactions with unprecedented efficiency. The experiment would require breakthroughs in optics, energy storage, and cooling systems, but in a world without limits, these hurdles vanish.
Building a Quantum Computer the Size of a City
Quantum computing promises to solve problems beyond classical computers, but current devices are tiny and fragile. One physicist envisions a quantum computer scaled up to the size of a city, with millions of qubits interconnected flawlessly. This massive machine could simulate complex quantum systems, solve optimization problems instantly, and crack encryption codes.
Such a quantum computer would require perfect error correction, advanced cooling systems, and new materials to maintain coherence over large distances. It could simulate entire biological systems or model the universe’s earliest moments. The experiment would push quantum technology to its ultimate limits, transforming computing and science.
Creating an Artificial Black Hole
A more radical idea involves creating a tiny artificial black hole in a controlled laboratory environment. This experiment would allow physicists to study gravity, quantum mechanics, and spacetime in ways never before possible. By generating a microscopic black hole, scientists could observe Hawking radiation and test theories about information loss and quantum gravity.
The challenge lies in safely producing and containing such an object without risking catastrophic effects. In a limitless world, advanced containment fields and energy sources would make this feasible. The insights gained could revolutionize our understanding of the universe’s fundamental laws.
Harnessing the Power of a Star
Finally, one physicist imagines harnessing the energy of a star directly. This experiment would involve building a Dyson sphere or swarm—a massive structure surrounding a star to capture its energy output. With this power, humanity could fuel unlimited experiments, from interstellar travel to creating new forms of matter.
Constructing such a megastructure would require materials and engineering far beyond current capabilities. It would also demand precise control over stellar dynamics. Yet, the payoff would be access to energy on a scale unimaginable today, enabling physics experiments that could reshape civilization.
The Power of Imagination in Physics
These wild experiments show how imagination drives scientific progress. While current technology limits what we can do, envisioning the impossible inspires new ideas and breakthroughs. Each experiment challenges our understanding of physics and technology, pushing us to dream bigger.
By exploring these concepts, physicists highlight the importance of creativity in science. Even if these experiments remain out of reach for now, they guide research directions and inspire future generations.
Science thrives on curiosity and bold ideas. Imagining a world without limits reveals the vast potential waiting to be unlocked.

