Unlock the Cosmos is a podcast about the greatest mysteries of the universe, space exploration, astronomy, astrophysics, and the future of humanity beyond Earth. From black holes and distant galaxies to the latest space missions, alien worlds, cutting-edge technology, and the search for extraterrestrial life, each episode explores the science and stories shaping our understanding of the cosmos.
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Our universe is big. It’s huge. It’s massive. And it’s expanding. But expanding into what? Does our universe resemble a balloon, expanding out into some grander space? Questions like this may seem simple, but they have stymied scientists and philosophers for centuries. From what we mean by “universe,” most people think of the things we can see — stars, galaxies, everything between that. But there is a limit to what we can observe. Light from the most distant galaxies has traveled billions of years to reach us, but the light has not had time to arrive beyond a certain distance. That’s the edge of our observable universe, the portion we can study. But what’s beyond that edge? Is there more? Or is there... nothing?
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10 Jul 2026
This Number Is So Big, It Doesn’t Fit in the Universe: TREE(3)
In some ways, TREE(3) mirrors the boundaries of the universe itself. Just as there are cosmic horizons we cannot cross—where galaxies fade beyond sight, where information from black holes is lost forever—there are also intellectual horizons. TREE(3) represents a boundary where our mathematical tools reach their limit, where numbers grow so large that even the largest infinities we typically think of seem small by comparison. It’s a concept that exists purely because we have the power to imagine it, yet it reminds us that some forms of imagination can’t be fully explored or expressed.
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10 Jul 2026
The Paradox Of Time That Terrifies Scientists
But the effects of time dilation are still visible today. When we look at distant galaxies, we’re seeing them as they were billions of years ago—closer to the time of the Big Bang. The light we observe from these galaxies has been traveling through space for so long that it has been stretched by the expansion of the universe, a phenomenon known as redshift. This redshift isn’t just a stretching of light; it’s also a stretching of time. The farther back in time we look, the more “stretched out” the signals become, showing us that time was moving differently in the early universe.
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