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Does the Universe Have an Edge — And What Awaits Beyond It? | Michio Kaku What would really happen if you launched a spacecraft from Earth and flew in a perfectly straight line forever? Would you eventually reach the universe’s edge? Loop back to where you started? Or encounter a mysterious boundary where space and time themselves come to an end? This is one of the deepest questions in modern astrophysics — and in this video, we break it down through the lens of ideas often discussed by Michio Kaku, American theoretical physicist and science writer. We begin with a deceptively simple puzzle: Why is the night sky dark? If the universe were static, infinite, and filled with stars, the sky should blaze like the surface of the Sun. This ancient riddle, known as Olbers’ Paradox, unlocks profound truths about cosmic expansion, time, and the structure of the universe. From there, we explore the Big Bang, the stretching fabric of space, and the concept of the Hubble sphere — a boundary beyond which galaxies are receding faster than light due to the expansion of space itself. We examine the possible shapes of the universe: a curved hypersphere, an infinite flat plane, or a cosmic saddle extending without end. The answers are astonishing. Today, 94% of all observable galaxies have already crossed beyond our reach forever. Every second, nearly 60,000 stars disappear beyond the cosmic horizon. And if the universe is infinite, there may be countless duplicates of you — exact cosmic twins — living out parallel histories in regions of space we will never reach. By the end of this exploration, you’ll understand the universe’s true scale, shape, and fate better than any astronomer of the past century could have imagined. ⚠ Disclaimer: Astronetic Pulse is an independent, fan-curated channel and is not formally affiliated with Professor Michio Kaku or any of his institutional or professional associations. The content is inspired by Dr. Kaku’s public lectures, writings, and interviews, and is produced solely for educational and inspirational purposes.