The pursuit of universal laws often feels like uncovering an inherent truth about reality, a truth any intelligent civilization would inevitably reach. But what if the physics we know isn’t a reflection of the universe itself, but a reflection of us – of the particular way human minds process information? This unsettling question, explored in Dr. James Bullock’s new book, Do Aliens Speak Physics?, isn’t about dismissing scientific progress, but about acknowledging the inherent subjectivity woven into the fabric of even our most objective endeavors. It’s a timely consideration as we continue to scan the cosmos for signs of life, and a crucial reminder that “first contact” might not be a simple exchange of data, but a profound challenge to our fundamental assumptions.
The core of Bullock’s inquiry stems from a deceptively simple thought experiment: would alien scientists, shaped by different biology and culture, arrive at the same physical laws we have? Headlines often portray this as a question of if aliens would find the same laws, but the nuance lies in how they might find them, and whether their “physics” would even resemble ours. The work isn’t proposing that gravity or electromagnetism wouldn’t exist, but that the way those forces are conceptualized, the mathematical frameworks used to describe them, could be radically different. This isn’t about alternative facts, but alternative perspectives – valid, internally consistent systems that explain the universe in ways we might struggle to comprehend.
Source material: newscientist.com.
Bullock, who divides his time between teaching at the University of California, Irvine, and analyzing data at the CERN particle physics laboratory, arrived at this line of questioning through conversations with philosophers of science. He realized that many pillars of physics, which feel intuitively “hardwired,” are actually contingent choices. Consider predicting a comet’s trajectory. We could account for every minute gravitational influence and material loss, but in practice, we simplify, choosing what to include and exclude based on the question we’re trying to answer. There’s no single “correct” model, only models “good enough” for the task. This principle of approximation extends to our most fundamental theories, which may be effective descriptions at human scales, but offer no guarantee of revealing bedrock truths as we probe deeper into nature.
One particularly striking scenario Bullock presents involves aliens who experience time not as a linear progression, but as a complete, navigable structure. Imagine a delegation encountering such a civilization, only to be told that sharing their technology is impossible “because of what will happen 74 years from today.” This challenges our deeply ingrained notion of causality – that causes precede effects – and aligns with some interpretations of quantum mechanics, like retrocausality, where future events can influence the present. While seemingly paradoxical, these ideas aren’t necessarily violations of physical law, but rather alternative frameworks for understanding the relationship between time and events. The existing reassurance that no faster-than-light signals or causal contradictions occur relies, Bullock argues, on a “classical notion of causality” that quantum mechanics hasn’t fully respected.
The implications extend beyond our understanding of time. Bullock also explores the possibility that aliens might not seek a single, unifying “theory of everything,” but instead embrace a pluralistic approach, utilizing multiple, incompatible frameworks, each valid in its own context. This mirrors the current practice in fields like weather forecasting, where multiple models are used and their outputs compared, rather than searching for a single “correct” prediction. The historical development of physics itself offers a parallel: Newton’s laws, energy-based approaches, and action-minimization principles all describe the same motions, yet each emphasizes a different fundamental concept. Philosophers of science suggest that empirical success alone isn’t enough to determine which, if any, represents the “true” underlying reality.
Perhaps the most radical proposition is that aliens might not even need physics as we understand it. Bullock draws a historical analogy to human technological advancements – steelmaking, antibiotics, even cathedral construction – which preceded a deep understanding of the underlying scientific principles. It’s conceivable that a civilization could develop sophisticated technology through trial and error, without ever feeling the need to ask “why” things work. This challenges the assumption that intelligence inevitably leads to a desire for explanation, suggesting that other species might prioritize reliability and usefulness over theoretical understanding. This isn’t a statement about alien inferiority, but a recognition that the tight coupling between science and technology we experience is a culturally specific phenomenon.
These scenarios aren’t meant to be definitive predictions, but thought experiments designed to expose the assumptions embedded within our scientific framework. Recognizing these assumptions isn’t a weakness, but a source of strength. By acknowledging the subjective elements of our understanding, we open ourselves to the possibility of revising and improving our theories. The next crucial research steps involve not just searching for extraterrestrial intelligence, but actively considering how different that intelligence might be, and how those differences might manifest in fundamentally different approaches to understanding the universe. Specifically, we should be asking: if we detect a technological signal from another civilization, what criteria will we use to determine if it represents a fundamentally different physics, and how will we even begin to decipher it? The answer to that question may be far more challenging – and far more rewarding – than simply finding evidence of life beyond Earth.
