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Casting Light on the Dark Universe, Euclid's Mission Shows Promise

Dec 23, 2023

3 min

Joey Neilsen, PhD

On December 7, 1968, the National Aeronautics and Space Administration (NASA) successfully launched the first functional space telescope into orbit. In the 55 years since, dozens of these crafts have embarked on missions of discovery, advancing and transforming our understanding of the cosmos.


Among the latest is Euclid, a wide-angle space telescope developed by the European Space Agency (ESA). Equipped to chart portions of the universe that are not directly observable and currently shrouded in mystery, Euclid is working to generate a three-dimensional map unlike any other, surveying billions of galaxies out to 10 billion light-years. This past month, the first images from its journey were released.


Joey Neilsen, PhD, is a world-renowned astrophysicist, a frequent collaborator with NASA and an assistant professor in Villanova University’s College of Liberal Arts and Sciences. From his perspective, Euclid’s early returns evidence its voyage’s incredible potential.


“In Euclid’s first image of the Perseus cluster, the sheer number of galaxies is really astonishing,” said Dr. Neilsen. “We talk a lot about how the universe is mostly empty space—and it is!—but it’s also enormous, and it’s really stunning that there’s room for so many galaxies in just a small patch of sky. There are 1,000 galaxies here huddled together in this cluster and over 100,000 in the background.


“I also note some pale purple patches in the image of NGC 6822. These are planetary nebulae, the layers of gas and dust blasted off by stars at the ends of their lives. It’s amazing to be able to see these so clearly in images that show the entire galaxy and its environment at the same time.”


According to Dr. Neilsen, Euclid’s remarkable visuals are the product of a calculated tradeoff. The ESA craft sacrifices the fine resolution of images taken by other observatories, like NASA’s James Webb Space Telescope, to capture cosmic phenomena in greater breadth. By collecting these visuals, Euclid aims to spark breakthroughs on subjects as of yet understudied—breakthroughs that could benefit Dr. Neilsen’s field of research.


“Euclid’s mission is to understand the evolution of the dark components of the universe: the invisible dark matter whose gravity holds large structures like galaxies and galaxy clusters together and the dark energy responsible for the accelerating expansion of the universe,” he explained. “Much of my research focuses on a different aspect of the dark universe (black holes), but there is a puzzle that might connect: observations of very distant galaxies show there were very massive black holes very early on. How did these behemoths grow so big so fast? If would be neat if Euclid helped us to better understand the early universe in a way that informed our understanding of the growth of black holes.”


In tracking and investigating the dark entities that compose and mold the cosmos, Euclid could very well offer insights into the history and development of over 95% of all energy and matter—and perhaps into the very fabric of existence itself. It is reasonable to wonder whether, when its mission is complete in six years’ time, the telescope could provide us with answers to questions that have gone unaddressed for six billion years.


“For me, the best-case scenario would be that Euclid would show clear evidence of something that’s hard to explain with our current models,” said Dr. Neilsen.


“For example, right now, we have ‘Hubble tension,’ a discrepancy between measurements of the expansion of the universe from when it was young and from the current era… The moments when things don’t add up are the ones where we learn the most about how the universe works. So, I’ll keep my fingers crossed for a surprise and for more to learn over the next six billion years.”


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Joey Neilsen, PhD

Joey Neilsen, PhD

Associate Professor of Physics

Professor Neilsen, PhD, uses X-ray telescopes to study black hole accretion disks, winds, and relativistic jets.

Black HolesBlack Hole AccretionSupermassive Black HolesAccretion DisksAccretion Disk Winds
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A Century and a Half of Connectivity: Professor Mojtaba Vaezi Reflects on the Evolution and Future of Communication Technology

On March 10, 1876, Alexander Graham Bell spoke the first words ever transmitted over telephone: “Mr. Watson, come here; I want you.” This simple request to Bell’s assistant, Thomas Watson, marked a significant milestone in direct person-to-person communication. Now, 150 years later, this message has paved the way for advanced cellular technology in the form of satellites, wireless networks and the personal devices we carry everywhere. For Mojtaba Vaezi, PhD, associate professor of electrical and computer engineering at Villanova University and director of the Wireless Networking Laboratory, Bell’s few words spoken over telephone marked the beginning of an ongoing technological revolution. “One hundred fifty years ago when telephone communication first started, there was essentially a wired line and a transmitting voice,” said Dr. Vaezi. “That simple, basic transmission has transformed the field of communication technology in unimaginable ways.” According to Dr. Vaezi, five shifts have defined the past century and a half of communication technology: wired devices to wireless, analog to digital, voice to data, fixed landlines to mobile phones and human-to-human communication giving way to an increasing focus on machines and artificial intelligence. Early wireless networks were built around one device per person. Today's networks must support multiple devices per person, plus the technology behind innovations such as smart homes, driverless cars and even remote surgery. “Applications are much more diverse now, so communication has to follow,” said Dr. Vaezi. “A big portion of communication now, in terms of number of connections to the network, is from machine to machine—not human to human or even human to machine." The growing number of connections can cause a host of issues for users. When multiple users share the same wireless spectrum simultaneously, their signals interfere with one another—a problem that is becoming more acute as the number of connected devices increases exponentially. Dr. Vaezi’s research at Villanova focuses on developing techniques that allow multiple users to transmit messages on the same frequency at the same time and still be understood. Another vibrant research area of Dr. Vaezi’s involves Integrated Sensing and Communication (ISAC). This field of study focuses on integrating wireless communications and radar so they can function within the same spectrum. “Historically, radar and wireless communication work in different bandwidths or spectrums and use separate devices. Although they are related, they happen in different fields,” said Dr. Vaezi. “Almost every communication scheme that has been developed has focused on this: How can we better utilize the spectrum?” ISAC is increasingly important as new innovations like driverless cars become fixtures in everyday life. These vehicles rely on radar to continuously scan for hazards, and when a hazard is detected, a signal must be sent to trigger safety mechanisms. Currently, the radar and communications systems operate on separate bandwidths using separate hardware. Dr. Vaezi's research explores how both functions could be housed in a single device running on one shared spectrum. Areas of study like Dr. Vaezi’s that focus on machine to machine communication are becoming increasingly relevant as communication technology evolves and moves away from simple person to person messaging. As for the next big milestone in communications, Dr. Vaezi is looking ahead to the implementation of 6G by 2030, though he tempers expectations. For most users, the change will feel modest, amounting to slightly faster device speeds. The most massive shift with 6G will be the amount of added coverage in areas that previously did not have network accessibility. “Say you order a package and it’s coming from somewhere abroad,” explained Dr. Vaezi. “6G will add network coverage over oceans, so you’ll be able to track your package in real time using that satellite technology.” The sixth generation of cellular technology will continue to connect our world and optimize current communications to accommodate more users and devices that need network access each day. It is far different from Alexander Graham Bell’s historic phone call 150 years ago. That brief exchange over a single wired line laid the groundwork for a communications ecosystem that now supports billions of devices, complex data networks and emerging technologies yet to be seen. It also serves as a reminder that despite how far communication technology has come, and how complex it has gotten, it all shares a common, simple goal: to transmit information from one point to another.

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The use of that data for scientific purposes—even ones that turn a profit— is not problematic in itself, says Professor Rutschman. “Some people may even choose a company that allows scientific research over one that doesn’t. Many people may not care, but some will. The uses are not common knowledge, and that is worrisome. The public should be well-informed about what’s happening.” Deeper problems may arise when they aren’t informed of those potential uses of their data. Professor Rutschman cited the infamous Henrietta Lacks case, in which Lacks’ cells were, and continue to be, one of the most valuable cell lines in cancer research. Neither Lacks nor her family were paid for the widespread use of her genetic material until a settlement was reached long after her death. “When you have biologics involved, a concern is that if you have something potentially valuable, you may not see any money from it.” Bankruptcy Can Cause Policy Upheaval To understand the role bankruptcy can play in all of this, one needs to refer back to the power of individual company policy in this space. There are no external laws that dictate how these companies can further monetize their data, says Professor Rutschman, as long as they don’t violate other laws, such as privacy laws. That means that when a company like 23andMe goes bankrupt, as was the case in 2025, new ownership could enact completely different corporate policies for use of their property. In their specific case, the company was essentially bought back by 23andMe founder and CEO Anne Wojcicki’s non-profit, all but ensuring policies would remain the same. But that is exactly why Professor Rutschman and others are highlighting this specific case. “Bankruptcy is bad in the sense that there's a lot of uncertainty,” she said. “In this instance, the person coming in was the person who was there before, so the policy is likely to continue. But that's very rare. There are a roster of companies with access to biological materials. 23andMe is a good example of something not going horribly wrong, but with the understanding that it absolutely could.” Ways in which that could happen could be new ownership undermining the original intent of the data use by cessation of the company’s previous policies, or charging exorbitant prices to other entities to use that data for scientific research. “Because there is no law, these new owners can essentially do as they please with their proprietary data, unless they do something incredibly careless that amounts to the level of illegal,” Professor Rutschman said. “And that is concerning.” Onus Falls to Companies to Enact Safeguards To ensure a worst-case scenario for such companies does not unfold in a bankruptcy situation, Professor Rutschman points to a number of safeguards they could enact to protect their original commitments, ensure equitable access to data for scientific research and promote fair trade. One of which is implementing a company policy stating that commitments from a previous iteration of the company need to be honored if ownership is transferred. Those could include, as the authors recommend, policies “honoring original research-oriented commitments under which the data were collected,” as well as not “enclosing the dataset for exclusive commercial use.” She also highlights the need for Fair, Reasonable, and Non-Discriminatory (FRAND) voluntary licensing commitments, which are inherently more science and market friendly. “Companies in many sectors have committed to this approach, and we are saying it should apply in this space as well. You’ll charge your royalty, but it can’t be a billion dollars for a data set, nor would it be done by exclusively selling to one entity. You can get that billion dollars by selling to 15, 50 or 100 companies, and from a scientific research perspective, that’s what we want. Otherwise, you have a monopoly or duopoly. “There are a lot of different models that can be used, but ultimately what we are arguing is leaving this unaddressed is a really bad idea. It leaves everything exposed, and something bad is more likely to happen.”

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