The ultimate floor of the universe is not perfectly still
In short: Imagine a world where heat vanishes entirely. Absolute zero is the theoretical limit where all thermal motion ceases, yet even there, nature refuses to be completely motionless. To reach this boundary, scientists must manipulate the smallest building blocks of reality, pushing matter into strange, quantum states.
Absolute zero represents the lowest possible temperature achievable in the universe. At this point, a substance loses all its heat energy, and its fundamental particles reach their minimal vibrational motion. However, thanks to the laws of quantum mechanics, particles never truly stop moving. They retain a baseline level of motion known as zero-point energy, which exists even when all other thermal energy is stripped away. This state of matter is defined by the absence of any remaining heat energy. It represents the absolute floor of temperature where nothing can get colder. Scientists are currently investigating how these materials behave as they reach lower and lower temperatures.
While absolute zero is a theoretical limit, scientists are constantly pushing closer to it. The coldest known location in the universe is the Boomerang Nebula, which sits at approximately -272°C. This is just one degree warmer than absolute zero. To study what happens as matter approaches this limit, researchers like Edward Hinds use sophisticated techniques to cool tiny molecules across different phases, observing how their behavior changes as they lose energy. Edward Hinds leads a team specifically experimenting with different cooling methods for tiny molecules. Their work aims to understand the transition of materials through various phases. These experiments help bridge the gap between known temperatures and the theoretical limit.
Reaching these extreme temperatures allows physicists to observe phenomena that defy everyday logic. In ultracold environments, atoms can form highly excited yet orderly configurations or reveal unusual quantum states, such as "Bethe strings" in cesium gas. By cooling matter to these near-absolute-zero levels, scientists can uncover hidden factors in chemical reactions and explore new states of matter, like altermagnetism, which could eventually transform the future of computing. One such discovery involves a hidden third form of magnetism called altermagnetism. This finding challenges over 100 years of established physics. Additionally, researchers have used these ultracold conditions to directly observe quantum states predicted by Hans Bethe nearly a century ago.
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Sources
- Summary by Intellect · source: How Do We Find Absolute Zero? | BBC Earth Science
- Also: Absolute zero
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