For decades, the concept of megastructures – massive artificial constructs built by advanced civilizations – has existed at the intersection of science fiction and serious astrophysical research. The idea was famously formalized in 1960 by physicist Freeman Dyson, who proposed that an intelligent species facing exponential growth would eventually need to dismantle its planetary system to construct an artificial biosphere capable of harnessing the total energy output of its parent star. This hypothetical “Dyson Sphere” would provide both immense power and vast living space.

While subsequent scientific inquiry has proposed numerous variations – collectively known as Dyson structures – many physicists have argued that such colossal constructions would be inherently unstable. However, groundbreaking research from Professor Colin R. McInnes of the University of Glasgow challenges this long-held assumption. Published in the Monthly Notices of the Royal Astronomical Society, McInnes’s latest study demonstrates that two specific types of megastructures – the Dyson bubble and the Stellar engine – could be engineered to achieve passive, long-term stability.

The research gained relevance in recent years following astronomical anomalies, such as the unexplained dimming of Boyajian’s Star, which reignited speculation about alien megastructures. McInnes, a leading expert in solar sails and space engineering, revisited the physics underpinning these colossal projects. By modeling a Stellar Engine as a flat, reflective disk, he discovered that a design concentrating mass at the edge could balance gravitational pull against radiation pressure, ensuring both stability and optimal propulsion. Similarly, he found that a Dyson bubble – a dense cloud of reflectors surrounding a star – could achieve self-stabilization if its elements are arranged to balance light pressure against gravity.

Beyond engineering feasibility, these configurations produce distinct technosignatures that could guide the SETI. A Stellar Engine would scatter reflected light, while a Dyson Bubble would alter a star’s spectral output without the flickering associated with orbiting debris. McInnes notes that his simplified model is just the starting point for understanding how such structures might exist. Ultimately, defining the parameters of stability may help astronomers know precisely what to look for when scanning the cosmos for signs of intelligent life.

For more details, read the full article by Universe today.