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American Focus > Blog > Tech and Science > Do black holes exist and, if not, what have we really been looking at?
Tech and Science

Do black holes exist and, if not, what have we really been looking at?

Last updated: September 29, 2025 10:49 am
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Do black holes exist and, if not, what have we really been looking at?
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Exploring the mysteries of black holes.

Christian Gralingen

Cosmology continues to be riddled with deep questions that bend our understanding of the universe. Concepts like “why is there something rather than nothing?” or “what exists beyond our universe?” remain at the forefront of scientific inquiries. One of the most persistent enigmas has been the question of what actually lies inside a black hole. After years of theoretical exploration, groundbreaking developments suggest we may finally be nearing answers.

Historically, black holes were thought to harbor singularities: infinitely dense points resulting from gravitational collapse. The existence of these singularities poses a quandary for physicists. If such points truly exist, they would necessitate a reassessment of fundamental physical principles. Since light cannot escape from a black hole, confirming the reality of singularities has long appeared impossible. Yet, if black holes lack them, can they truly be classified as black holes?

A new generation of astronomers is on the verge of breaking new ground in this exploration.

“We’re now in a transformative period where observational technology is reshaping theoretical physics,” says Alexandru Lupsasca from Vanderbilt University. “It feels like the dawn of a golden era in astrophysics.”

This renaissance is driven largely by the pursuit of a framework that transcends general relativity, Albert Einstein’s comprehensive model of gravity established in 1915. Following Einstein, physicist Karl Schwarzschild discovered the concept of the Schwarzschild radius, a critical threshold defining the size at which an object becomes a black hole. If a mass shrinks below this radius, it succumbs to a gravitational collapse where not even light can escape, forming the theoretical singularity.

Investigating Singularities

To most physicists, singularities are problematic. Their existence contradicts our physical intuition. Lupsasca articulates, “Singularities indicate a breakdown in our current equations, signaling the need for a more profound theoretical understanding.”

Despite their theoretical implications, black holes are well-established astronomical phenomena. Observational evidence, including gravitational wave detections by the Laser Interferometer Gravitational-Wave Observatory (LIGO), has confirmed their existence throughout the cosmos—from the centers of distant galaxies to remnants of stellar exploders.

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In 2016, LIGO’s detection of gravitational waves marked a monumental moment in astrophysics. This resonance confirmed predictions from general relativity and demonstrated the violent encounters between black holes. By 2019, the Event Horizon Telescope (EHT) provided direct imaging of a black hole for the first time, shifting these enigmatic entities from theoretical discussion into the realm of observational science.

“Enhanced observation capabilities have sparked renewed interest in understanding black holes,” states Raúl Carballo-Rubio from the International School for Advanced Studies. “More data means deeper inquiries into these cosmic structures.”

Though the empirical evidence for black holes is substantive, this does not automatically imply the existence of singularities. Indeed, many astrophysicists advocate that singularities are mathematical artifacts arising from our current understanding of physics. They suggest that the true nature of black holes defies a simplistic view.

Physicists are working to develop models that could prevent singularities from forming altogether, often referred to as “regularizing” black holes. These models occasionally propose the existence of a new force of nature counteracting gravity, which might emerge under the extraordinary density conditions present inside a black hole. Instead of infinitely dense matter at the core, a “regular” black hole could feature a core of extreme but finite density.

However, confirming such models in astrophysical contexts poses its own challenges. Observers will need to detect subtle signatures of new physics beyond the event horizon itself, such as unexpected spins or distortions in the surrounding space-time.

One particularly intriguing approach relies on the paths taken by light as it navigates the gravitational field around a black hole. In the vicinity of a black hole lies a crucial area where light can orbit temporarily before being captured. This “photon ring” encircling the black hole could potentially reveal deviations from expected behaviors predicted by general relativity—offering compelling evidence for new physics.

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Analysis of images from the EHT identified this photon ring glowing amidst the dark, confirming that these circular orbits could provide essential data to unravel the mysteries hidden within black holes. However, separating the signal from various light sources presents a formidable challenge.

A promising endeavor, the proposed Black Hole Explorer (BHEX), aims to place observation capabilities in space, thereby enhancing the resolution of images obtained from black holes. If funded by NASA, this mission could launch by 2031, allowing scientists to discern the elusive photon ring much more clearly from a significant distance of 20,000 kilometers above Earth.

The light surrounding black holes not only offers clues to their internal structures but may also reveal their fundamental nature. Notably, any potential deviations in the size of a black hole’s shadow—the dark area that obscures its presence—could indicate profound insights into the physics governing these cosmic phenomena.

Ongoing research leveraging EHT measurements has begun testing various models that could provide insight into “regular” black holes. Researchers have explored predictions about the shadow size of Sagittarius A*, the notable supermassive black hole at our galaxy’s heart. The findings, however, have led to the conclusion that presently available observational abilities are insufficient to highlight variability among models, highlighting the necessity for advanced techniques.

Challenging Black Hole Assumptions

Alternatively, some theorists are speculating whether black holes as we understand them might not exist at all. What if we’ve been observably misled by celestial bodies that do not conform to classic black hole definitions? Such objects, which could resemble black holes from a distance, might lack both singularities and event horizons, showcasing distinctive surfaces.

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A prominent theory revisions these entities as “gravastars,” proposed as bubbles filled with repulsive energy encased in an ultra-dense shell. Theoretical constructs also suggest the existence of boson stars or electroweak stars—non-singular, stable structures that could mimic the appearance of black holes without the associated extreme properties.

New scientific concepts regarding black holes.

While the concepts of black hole mimickers stimulate intriguing discussions, distinguishing them from true black holes—a feat particularly challenging during gravitational wave detections—remains an evolving field of study. Mergers of compact objects typically produce unique “chirps” indicative of their properties, but mimickers might create observable echoes from their surfaces.

Early indications of such echoes have been suggested, though concrete confirmations are still pending. Research on merger events relies heavily on accurate signatures, yet discrepancies in theories may hinder potential discoveries.

The pursuit of understanding black holes is ongoing and ever-more fascinating. It calls for an examination of where new physics might manifest. If phenomena occur within event horizons, we will likely develop an understanding of regular black holes. Conversely, if they exist at the boundaries of these horizons, we may be encountering a myriad of black hole mimickers instead. The difference between these two scenarios carries significant implications for our comprehension of the universe.

In a universe where singularities are irrefutably real, we might face a paradigm shift regarding the obliteration of information, akin to an “universal shredder.” The unforgettable revelation could demand reconsideration of our understanding of fundamental physics, especially the idea that information within the universe can never die once released.

Ultimately, as physicists continue unraveling the enigma of black holes and their interiors, the journey holds both exhilarating discoveries and humbling realities—accepting elements of the universe that may always remain beyond our reach and comprehension.

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