During the formation of stalactite and stalagmite in karst caves carbonate minerals often trap gas and aqueous fluids, forming immiscible fluid inclusion population when they are crystallizing.

When the laser trap was turned off and back on again, the ultra-cooled gas oscillated like a jelly sphere.

The Fermi gas is governed by quantum dynamics and held in place by the laser trap, allowing the group to simulate the conditions of the tightly packed neutrons inside a neutron star.