Time To Restore Confidence In Evidence-Based Science – Avi Loeb

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[This is an Abstract* of an article in Salon.com dated 13 February 2021: Editor’s note]

Immunology and alien-hunting require the same scientific methods. Scientists aren’t articulating this very well.

From astronomy to immunology, it’s time to restore confidence in evidence-based science.

The widespread availability of an FDA-approved vaccine for COVID-19 will not ensure its consumption by the public. This is reflective of a broad cultural problem — there is a deep undercurrent of mistrust, especially of elites, running through American society today — but it also echoes a cultural problem in the world of science, specifically.

Americans of all stripes have come to regard scientists as part of the elite, in part because they have sequestered themselves in an ivory tower, saturated with ambition for academic honors and consumed with sterile intellectual gymnastics. Much of current scientific culture focuses on nuances whose sole purpose is to garner their researchers higher academic status by impressing colleagues, rather than serving the public’s interest or carrying any practical relevance for our daily life.

This state of affairs is particularly apparent in my field: the world of physics.  For instance, in theoretical physics, a phalanx of untestable notions—about the multiversehypothesized extra dimensions, the idea that we live in a simulation, and the argument that there is no need for experimental evidence to justify the string theory strategy in unifying quantum mechanics and gravity—occupy centerstage. At the same time, there is a taboo on an open discussion of certain common-sense questions, such as whether there are other intelligent civilizations in outer space and whether our civilization is the smartest kid on the galactic block.

….When the first interstellar object, ‘Oumuamua, was glimpsed passing through our solar system in October of 2017, scientists quickly agreed that it was weird on half-a-dozen counts: it had a flattened shape with extreme proportions never seen before among comets or asteroids, an unusual initial velocity, and a shiny appearance; it lacked a cometary tail, but nevertheless it exhibited  a push away from the Sun not explainable by gravity. However, despite these anomalies, the mainstream scientific community immediately declared business as usual and decreed the object to have been an unusual asteroid or comet—albeit one that was unlike any asteroid or comet seen before. The response brought to mind a kid who has encountered many cats at home and, upon visiting the zoo and seeing an elephant, simply assumes it to be an unusual cat. Such naivete is charming in a child; it is less tolerable in a scientist.

We ought to hold ourselves to a higher standard, I felt — so several months after ‘Oumuamua was first sighted, I suggested that its weirdness may imply that it was a product of an alien technology, possibly a thin sail pushed by sunlight. (Our own civilization has dreamed of such a perfect spacefaring technology for decades, and I had recently helped to design a prototype of one for the Breakthrough Starshot Initiative, an effort—supported by earthbound innovators and dreamers such as Yuri Milner—to reach our closest neighboring star within our lifetimes.)


I first articulated this hypothesis in a commentary that I published in Scientific American; I subsequently quantified it in a scientific paper with my postdoc, Shmuel Bialy. Although far from the most speculative thing I have ever published — indeed, in comparison to some of my research on dark matter, the paper was rather tame — it generated quite a fuss. It was accepted for publication within a few days of its submission to The Astrophysical Journal Letters. It became the only paper I know of to have been quoted verbatim on both CNN and Fox News, and to have inspired a new brand of wine (“Cuvée ‘Oumuamua” by Bonny Doon). And judging by my inbox, it has stirred a great deal of interest in people far beyond the rarefied halls of academia.

But my idea also generated an impulsive pushback within the scientific mainstream. Some scientists expressed a strong opinion on Twitter based on prejudice without studying the evidence. It would have been better if they had followed the advice of basketball coaches: “keep your eyes on the ball and not the audience”.  After all, by siding with the mainstream during Galileo Galillei‘s days, we would have given justification to placing him in house arrest rather than looking through his telescope. This would clearly be in contradiction to our current support of evidence-based science. Reality does not go away if you ignore it.


Yet my colleagues at the forefront of the search for extraterrestrial intelligence seem to have forgotten this fundamental scientific principle. In contrast to its cool reception in the scientific community, SETI hits a nerve in the general public. There lies a paradox: the public pays taxes that support science and is more eager to know the answer to the question: “are we alone?” than: “are WIMPs the dark matter?”, not to speak about supporting speculative notions of “extra dimensions” or the “multiverse”, which have no reality check to their credit.

Ironically, indeed, the reason that physicists enjoy freedom is that their blue-sky mainstream used had practical impact. The stable funding of physics stemmed from Vannevar Bush’s vision of “The Endless Frontier” after the demonstrated relevance of the Manhattan Project to society. Why would the mainstream scientific community shy away from the public’s interests and focus on esoteric questions that have little relevance to the layperson? Are scientists supposed to hide behind the opaque technical walls of a self-sustained bubble and ignore the public that funds their research?

Previous generations of physicists understood that when evidence is incomplete, we have to live with scientific uncertainty and consider multiple interpretations of the available data. I fear that physicists today, like their oft-disparaged counterparts in the SETI community, have forgotten this important principle. Nowhere in science is this failure clearer, in my opinion, than in the scientific community’s response to the half-dozen anomalies displayed by the first interstellar object that we have discovered.

A scientist must go where the evidence is—but too often, our scientists do not. I do have hope for the future, however. My optimism stems from raising my young daughters, who have no inhibitions in exploring the truth; this is why they learned so much over the short term of their childhood. Perhaps scientists should behave more like kids. Mistakes are an inevitable part of our learning experience as students of mother nature, humbled by the fact that its splendor often exceeds our imagination.


Science is a never-ending work in progress. We show integrity by entertaining multiple possible interpretations of evidence to the public. The new generation of innovators should not be held hostage by the mistakes of the past. After standing in line at the bank, I never hear the cashier saying that I am not allowed to cash my check because the customer ahead of me had an overdraft. We should examine each case based on its own merit.

Scientists could regain the public’s trust by being straightforward about the inevitable roller-coaster of trial and error associated with innovation — whether it be the search for a vaccine for COVID-19 or the search for technological signatures of other civilizations.  Rather than pretending to know the outcome in advance, we should admit what we do not know and study all possible interpretations, so that the public will believe our robust conclusions when new evidence brings clarity.


[Note by editor: If this abstract has whetted your appetite to read the whole article (about twice the length of this abstract) do go to this issue of salon.com]


Avi Loeb is the former chair of the astronomy department at Harvard University (2011-2020), founding director of Harvard’s Black Hole Initiative and director of the Institute for Theory and Computation at the Harvard-Smithsonian Center for Astrophysics. He also chairs the Board on Physics and Astronomy of the National Academies and the advisory board for the Breakthrough Starshot project, and is a member of the President’s Council of Advisors on Science and Technology. He is the author of “Extraterrestrial: The First Sign of Intelligent Life Beyond Earth”.

*Abstract noun ab·​stract | \ ˈab-ˌstrakt  , in sense 2 also ab-ˈstrakt  \Definition of abstract (Entry 2 of 3)1: summary of points (as of a writing) usually presented in skeletal form; alsosomething that summarizes or concentrates the essentials of a larger thing or several things