The Collective Nature of Scientific Endeavours
How many individuals are necessary to secure a Nobel Prize? Or, to engineer a neutrino detector that could potentially lead to such an accolade? Even more simply, how many people are required to produce a pencil? You might think just one person is sufficient, but Leonard Read’s provocative essay “I, Pencil” challenges this assumption. He posits that no single individual possesses the requisite knowledge, tools, and skills to create even a basic pencil independently. The task of felling a tree for wood necessitates a saw, which in turn requires iron ore extraction and steel smelting. This is just the beginning, as one must also consider the graphite, paint, rubber, and metal ferrule needed to complete the pencil. Thankfully, the invention of the pencil and its components has been a collaborative effort involving many skilled individuals.
One of the most compelling aspects of scientific inquiry is its inherently collaborative and cumulative nature. Ignacio Taboada explains that “certain scientific achievements cannot be realised by an individual alone; constructing a detector like IceCube is a collective endeavour. Francis Halzen rightfully earned the Nobel Prize for his visionary leadership since the late 1980s, when he proposed the concept of IceCube: ‘This is a brilliant idea; let’s build it’. He gathered a team, guiding the project forward. However, the construction and operation of IceCube is the result of contributions from a multitude of people—over 420 individuals from 58 institutions across 14 countries, all working in concert.”
The Journey of Ignacio Taboada
Professor Ignacio Taboada teaches Physics at the Georgia Institute of Technology in Atlanta, USA. His academic journey began with a Physics degree from Simón Bolívar University in Caracas, Venezuela, followed by a PhD in Physics and Astronomy from the University of Pennsylvania in Philadelphia. His research primarily revolves around particle astrophysics.
After completing his doctorate and spending a couple of years in Venezuela, Taboada returned to the United States to immerse himself in the IceCube project, a neutrino observatory constructed deep within the Antarctic ice at the Amundsen-Scott Station at the South Pole. With Francis Halzen receiving the Nobel Prize in Physics in 2026 for his contributions to the detector, Taboada served as the spokesperson for the IceCube collaboration from 2021 to 2025 and has been involved in numerous studies related to the detector.
Understanding the Mysteries of Cosmic Neutrinos
In an interview, Taboada shared insights regarding the future of cosmic neutrino research following the Nobel Prize announcement. When asked if the Nobel awarded to Halzen signifies the resolution of the enigmatic nature of neutrinos, Taboada clarified, “This is largely a beginning, not an end. Astronomy has traditionally relied on visible light or telescopes, but in the last century and a half, we have expanded our horizons to include invisible light such as X-rays, ultraviolet, radio waves, and infrared. Moreover, we have the capability to utilise entities that are not light at all. This Nobel recognises our ability to employ neutrinos—non-light particles—to conduct astronomy. What discoveries lie ahead? That remains uncertain, which is the thrilling aspect of this field. Each time a new type of telescope is invented, previously unimagined phenomena are uncovered.”
While the Nobel Prize is awarded to Halzen, it acknowledges a broader narrative involving countless contributors. Taboada reflected on his personal contributions, stating, “I began my journey as a PhD student in 1998 working on AMANDA, the predecessor to IceCube. AMANDA was instrumental in demonstrating that a detector could be built in the South Pole and effectively operated, despite significant logistical challenges. I have also contributed extensively to IceCube, which ultimately led to the Nobel Prize. My work includes significant contributions to many publications arising from IceCube data. Additionally, I served as the spokesperson for IceCube during the years 2021 to 2025, representing a collaboration of over 420 individuals from 58 institutions across 14 countries.”
The Unforeseen Success of IceCube
Reflecting on his early days with AMANDA, Taboada expressed his astonishment at IceCube’s success, admitting, “I never anticipated the immense success IceCube would achieve. I naively believed that obtaining approval for its construction would be straightforward. At the time, IceCube was the largest project ever undertaken by the National Science Foundation in the United States, which was quite impressive.”
In discussing the current understanding of astrophysical neutrino sources, Taboada noted, “Currently, we have very little knowledge regarding the origins of these neutrinos. We are aware that they originate from beyond our solar system, which qualifies them as astrophysical neutrinos. However, pinpointing their exact sources remains a significant challenge. Most of these neutrinos arrive from all directions with roughly equal probability, similar to the distribution of distant galaxies. Consequently, we suspect that many of these neutrinos are emanating from far-off galaxies.”
Unraveling the Cosmic Mysteries
Taboada continued, “We have also studied our own galaxy. When observing the Milky Way at night, it appears as a band across the sky. If there are neutrino sources within our galaxy, we would expect to detect a concentration of neutrinos emanating from that direction, rather than arriving from all angles. While we have indeed detected neutrinos from the Milky Way, their abundance is significantly lower than that of other parts of the universe, which is quite peculiar given that the Milky Way is much brighter compared to distant galaxies. This suggests that there are unique processes occurring in those other galaxies that are not present in our own, resulting in a scarcity of neutrinos.”
The Challenge of Identifying Neutrino Sources
Taboada explained the inherent difficulties in identifying neutrino sources, stating, “While we can ascertain the direction from which a neutrino originates, the actual pinpointing is challenging. With IceCube, we can determine a neutrino’s direction with an accuracy of about half a degree, roughly the width of a thumb. However, behind that thumb lies a vast expanse of the universe, filled with countless galaxies. Therefore, tracing the neutrino back to its source is incredibly complex. In the future, we may achieve a precision of about 0.1 degrees, but that is likely the limit.”
He elaborated, “Thus, detecting a single neutrino is insufficient; we must observe multiple neutrinos from the same source, which leads us to focus on particularly bright sources. To date, we have evidence for only two specific galaxies: one relatively close, Messier 77 (or NGC 1068), and another, TXS 0506+056, which is much more distant. Yet, we have perhaps identified only 1% of the sources, leaving the majority of neutrinos shrouded in mystery. This is where the excitement lies; we are only just beginning to scratch the surface.”
Speculations on Neutrino Sources
When asked to speculate on the types of objects that might produce the majority of cosmic neutrinos, Taboada responded, “This is not a particularly bold prediction, as it aligns with the thoughts of many contemporary scientists. As I mentioned, the Milky Way appears to be quite deficient in neutrinos. Our galaxy is quite ‘normal’ in comparison to others. Hence, we need to seek out special galaxies, and one potential candidate for such specialness is what we refer to as ‘active galaxies’.”
He further explained that “at the centre of every large galaxy lies a supermassive black hole. In the case of the Milky Way, it has a mass approximately two million times that of the Sun; it is substantial and surrounded by minimal material. We can confirm its presence by observing stars in orbit around it, but little else.”
The Promise of IceCube-Gen2
Taboada elaborated on IceCube-Gen2, stating, “The vision for this second generation is to expand on IceCube by constructing an even larger detector around it. The final structure will be eight times the volume of the original, encompassing sensors spread across eight cubic kilometres. The logistical challenges remain significant; working at the South Pole is inherently difficult, requiring the transportation of large volumes of materials, which is no small feat. Construction activities are limited to a narrow window from early November to mid-February when temperatures are milder; outside of this period, the harsh cold precludes operations.”
Exploring New Frontiers with P-ONE
Regarding his involvement in the development of P-ONE, Taboada explained, “With IceCube’s success, new ideas for neutrino detectors are emerging. In astronomy, it is common to have multiple telescopes that complement each other.” He noted, “Given that IceCube is located at the South Pole, the best view of the northern sky is still desired; neutrinos traverse the entire Earth, allowing us to filter out noise from other cosmic particles. Hence, to achieve optimal observations of the southern sky, a detector in the northern hemisphere is essential.”
P-ONE is currently being constructed on the ocean floor near the coast of Canada, close to Vancouver and Seattle. Taboada discussed the advantages of this location, stating, “The method