LQG's discreteness predictions require Planck-scale energies (~10^19 GeV) inaccessible to any foreseeable experiment, making falsification practically equivalent to string theory's situation.

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GeV (Gigaelectronvolt)(measuring the energy needed to test the theory): A unit of energy used in physics; a GeV is about the energy of a flying mosquito, but when physicists talk about 10^19 GeV, they mean an absurdly large amount of energy.
LQG (Loop Quantum Gravity)(as the main subject of the statement): A scientific theory trying to explain how gravity works at the smallest scales of the universe by imagining that space itself is made of tiny loops rather than being smooth and continuous.
Planck scale(describing the energy level required to test LQG): The incredibly tiny size and energy level where physicists think the current laws of physics break down and quantum gravity effects become important; it's about 10^-35 meters, far too small to directly observe.
String theory(as a scientific theory being discussed): A theoretical physics framework that proposes the fundamental building blocks of the universe are tiny vibrating strings rather than particles, though it hasn't been proven experimentally.

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