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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...
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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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10 JUL 2026 · 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? Become a supporter of this podcast: https://www.spreaker.com/podcast/cosmos-science--7164841/support.
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10 JUL 2026 · 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. Become a supporter of this podcast: https://www.spreaker.com/podcast/cosmos-science--7164841/support.
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10 JUL 2026 · 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. Become a supporter of this podcast: https://www.spreaker.com/podcast/cosmos-science--7164841/support.
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10 JUL 2026 · But the thing is that our brain is made up of a complex network of nearly 100 billion neurons that form 100 trillion neural connections. These neurons are organized into networks of nodes, filaments, and clusters that shape your thoughts, feelings, and emotions. But these neurons make up less than 25 percent the mass of your brain, leaving the remaining 75 percent as water. In a bizarre coincidence, the observable universe also contains an estimated 100 billion galaxies. The teetering balance between the pull of gravity and the accelerated expansion of the universe forms a cosmic web of string-like filaments composed of ordinary and dark matter. Become a supporter of this podcast: https://www.spreaker.com/podcast/cosmos-science--7164841/support.
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10 JUL 2026 · Cosmic voids represent the most enduring time capsules in the cosmos, remaining largely unchanged over billions of years. Defined by their sparse matter content, these voids provide a pristine and unparalleled environment for studying the universe. Within these vast expanses lie answers to numerous cosmological mysteries. As cosmological laboratories they offer insights into the fundamental nature of dark matter and dark energy, reveal details about the ancient universe, and provide crucial information on the formation of galaxies. Thus, our greatest insights into the universe's mysteries may only be uncovered through careful exploration and study of these expansive regions of emptiness. Become a supporter of this podcast: https://www.spreaker.com/podcast/cosmos-science--7164841/support.
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10 JUL 2026 · Let’s begin from the beginning, or at least what scientists tell us is the beginning. Around 13.8 billion years ago, all of existence—the universe, space, time, and every speck of matter—erupted from a single, infinitely dense point. This monumental event, known as the Big Bang, was not just the birth of stars and galaxies, but the creation of space and time itself. Before this moment, there was no "before" as we understand it, because time, as a concept, didn’t exist. In an instant, this initial singularity expanded at an unimaginable rate, forming the building blocks of the universe. Yeah, I’m sure many of us have heard this same story countless times. And if you’re anything like me, you might feel like there’s something missing here—like this explanation isn’t quite enough. The truth is, there are many creation stories out there—each culture and civilization, across history, has had its own take on how everything came to be. In fact, if you were to scroll through Wikipedia’s list of creation myths, you’d find hundreds of different versions—some involving gods, others magical forces, or cosmic battles. Each one, in its own way, trying to explain the same fundamental question: how did everything begin? Become a supporter of this podcast: https://www.spreaker.com/podcast/cosmos-science--7164841/support.
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10 JUL 2026 · Physics has reached a point where many things aren’t directly measurable. If we create a theory that explains everything in the observable universe and requires a multiverse, some scientists would accept that we may never know everything. Others might continue exploring different possibilities, refusing to accept those limits. Most people would agree that it would be ideal to have a theory of the universe that’s self-consistent, covers everything, and doesn’t rely on things we can’t observe. But that might not be possible. Some researchers argue that if something can’t be tested in the usual scientific ways, it isn’t real science—it’s pseudoscience. For you, the question is whether the goal of science is to discover the truth about the universe, or just to focus on things that can be proven through experiments. Become a supporter of this podcast: https://www.spreaker.com/podcast/cosmos-science--7164841/support.
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10 JUL 2026 · Over time, through various experiments, we've discovered something interesting about tiny particles called quanta. These particles act like both waves and particles at the same time, and what we see depends on how we choose to measure them. From what we can tell, there isn't one fixed and certain reality that exists on its own; instead, it seems like the way we observe or interact with these particles plays a crucial role. In this Universe, it turns out you have to observe things to figure out what they are. So, when we conduct experiments and choose a way to measure these particles, it's like asking them, "Are you more of a wave or a particle right now?" Surprisingly, the answer depends on how we ask the question. This concept challenges the idea that there's one fixed and certain reality for these particles. I always find it absolutely mind-bending to think that all around us in every direction is the first light from the Universe. It’s taken 13.8 billion years to reach us, and although we need microwave eyes actually to see it, it’s there, everywhere. Become a supporter of this podcast: https://www.spreaker.com/podcast/cosmos-science--7164841/support.
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10 JUL 2026 · Kardashev’s question can be asked in another way: What are the universal steps in a civilization’s journey toward advanced technology? The idea is that most, if not all, civilizations would go through certain stages as they evolve, and some of these stages might be noticeable when we try to detect them. While Kardashev was mainly interested in finding signals from distant civilizations, his scale gave us a clear way to think about how they might develop. Achieving the heights of a Type 7 civilization would require humans to overcome challenges that seem impossible by today’s standards. First, we would need to master our planet's energy (Type 1), then expand to harness the power of our star and beyond (Type 2 and 3). Each step would demand radical advances in technology, intelligence, and perhaps even our biology. We’d need to survive for millions of years, avoid self-destruction, and evolve beyond the limitations of our current understanding of physics. Become a supporter of this podcast: https://www.spreaker.com/podcast/cosmos-science--7164841/support.
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10 JUL 2026 · To understand how the Universe creates intelligent life, we need to consider two things. First, we must understand the steps that led to our own existence. Second, we need to explore how intelligence could arise in different circumstances from ours, and we should aim for accuracy in our analysis. We must also avoid making unfounded assumptions or falling for logical fallacies, such as mistaking "absence of evidence" for "evidence of absence" or assuming causation from mere correlation. Become a supporter of this podcast: https://www.spreaker.com/podcast/cosmos-science--7164841/support.
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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...
show more
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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