Earlier this year, physicists proposed a groundbreaking solution to one of the biggest mysteries in modern physics: the singularity at the center of black holes. Some scientists now suggest that singularities might not exist at all—but not everyone agrees, reports space.com.

A singularity is a point where matter becomes infinitely dense, bending space-time so much that the laws of physics break down. Imagine squeezing the entire Sun into a tiny speck smaller than a grain of sand—that’s the kind of extreme density we’re talking about.

According to Einstein’s theory of relativity (1916), black holes should contain such a singularity. But infinite density doesn’t make sense in physics, so researchers have been searching for alternatives.

To solve this problem, some physicists tweaked Einstein’s equations, suggesting that instead of a singularity, black holes might have a highly curved, yet finite, core. Think of it like a stretched rubber sheet that never actually tears—just bends to its limit.

However, theoretical physicist Nikodem Poplavsky (University of New Haven) disagrees. He argues that this solution relies on unproven extra dimensions—like saying our universe has hidden directions beyond up-down, left-right, forward-backward, and time.

Since we’ve never detected these extra dimensions, Poplavsky believes the theory is more math than reality.

He also points out that inside a black hole, space-time should be dynamic, not static. Poplavsky thinks the only way to truly solve the singularity mystery is if black holes create entirely new universes—meaning our own universe might have been born inside one.

If true, we could find clues in cosmic background radiation or gravitational waves.

But don’t expect answers anytime soon. Poplavsky compares it to gravitational waves: Einstein predicted them in 1915, but scientists only detected them in 2015. Similarly, the singularity puzzle might take another century to solve—meaning we may not know what’s inside a black hole until the 22nd century.

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