How NASA uses microgravity to create the universe's coldest, fluffiest molecules
On Earth, gravity makes fragile quantum experiments collapse almost instantly. But aboard the International Space Station, NASA's Cold Atom Lab is using microgravity to study atoms that behave less like billiard balls and more like waves, pushing the boundaries of quantum chemistry.
The Cold Atom Lab, launched to the International Space Station in May 2018, operates in a realm of extreme cold. By using lasers and magnetic fields, scientists controlled from Earth can cool groups of atoms to temperatures far below anything found in the natural universe. These temperatures reach fractions of a degree above absolute zero, which is minus 459 degrees Fahrenheit (minus 273 degrees Celsius). At these ultracold levels, atoms can form a Bose-Einstein Condensate (BEC), a fifth state of matter that makes quantum properties easier to observe macroscopically.
The primary obstacle to this research on Earth is gravity. In a terrestrial lab, the fragile states required for quantum study often break apart or collapse. In the microgravity of the ISS, however, atoms can be studied for longer periods. This environment allows researchers to explore 'fluffy' molecules—scenarios where atoms in a molecule remain bound but grow increasingly far apart. While physicists have created these enlarged molecules on the ground, they are too unstable to be imaged directly; the ISS provides the stability needed to potentially observe three-atom molecules in a larger state.
This breakthrough in quantum chemistry, recently detailed in the November 1:: 2024 issue of Nature, marks the first time scientists have produced a quantum gas containing two different types of atoms in space. Beyond pure science, these experiments could lead to highly sensitive detectors capable of measuring subtle changes in magnetic fields. The long-term goal is to transition quantum technologies—which already power our GPS, cellphones, and medical devices—into space-based tools that can help us decode the fundamental laws of the universe.
Source: How Atoms Are Defying Gravity in NASA's Cold Atom Lab
