Spacetime is often described as the stage on which the universe unfolds, a four-dimensional blend of space and time that bends, stretches and shifts as matter and energy move through it. However, despite more than a century of work since Einstein introduced general relativity, physicists still struggle to describe how that stage evolves when gravity becomes violent, nonlinear and hard to predict. A new theoretical study points to a different way of looking at the problem. Instead of treating spacetime only as geometry, researchers found that some of its structures may behave more like features in an electrically conducting fluid. In this view, these structures stay connected as spacetime changes. That idea comes from researchers at Adolfo Ibáñez University in Chile and Columbia University, whose work was published in Physical Review Letters. Using tools borrowed from electrodynamics and plasma physics, they argue that spacetime can contain what they call gravitational field connections. Additionally, they describe conserved quantities that place topological limits on how curved spacetime can evolve. In plain terms, topology deals with what stays …