エピソード

  • A Dark Matter Sheet Shapes the Motion of the Milky Way

    A Dark Matter Sheet Shapes the Motion of the Milky Way
    2026/02/01
    New research suggests the Milky Way and Andromeda lie within a vast, flat sheet of dark matter stretching millions of light-years. Using detailed computer simulations, scientists explain puzzling galaxy motions that once seemed to defy gravity.

    This planar structure—bounded by enormous cosmic voids—allows nearby galaxies to follow the universe’s expansion despite strong local gravity, bringing theory and observation into rare alignment in our cosmic neighborhood.
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    35 分
  • Did Earth’s Water Come from Space? New Clues from Lunar Samples

    Did Earth’s Water Come from Space? New Clues from Lunar Samples
    2026/01/30
    This episode examines new evidence from Apollo-era lunar samples suggesting that most of Earth’s water did not come from asteroid or comet impacts.

    By studying oxygen isotopes preserved on the Moon’s stable surface, researchers found that meteoritic contributions were surprisingly small.

    These findings challenge long-standing theories about the origin of Earth’s oceans, while offering new insight into how our planet became habitable—and how lunar resources could s
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    38 分
  • Enceladus and the Chemistry of Life Beneath Icy Moons

    Enceladus and the Chemistry of Life Beneath Icy Moons
    2026/01/28
    Laboratory experiments in Japan and Germany have recreated the subsurface ocean conditions of Enceladus, Saturn’s icy moon.

    By cycling simple chemicals through heat and freezing—mimicking hydrothermal activity—scientists produced amino acids, key building blocks of life. The results match organic signatures detected by NASA’s Cassini mission, suggesting Enceladus may be actively generating complex chemistry today.

    This research strengthens the case for ocean worlds as promising targets in the search for extraterrestrial habitability.
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    30 分
  • Dark Energy Survey Reveals New Clues About the Expanding Universe

    Dark Energy Survey Reveals New Clues About the Expanding Universe
    2026/01/26
    After six years of observations, the Dark Energy Survey has delivered its most precise analysis of cosmic expansion, based on hundreds of millions of galaxies.

    Using weak gravitational lensing and galaxy clustering, scientists refined measurements of dark energy and confirmed much of the standard cosmological model—while revealing a persistent tension in how matter clusters across time.

    These results deepen our understanding of the accelerating universe and set the stage for the next generation of cosmic observatories.
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    27 分
  • How Supermassive Black Holes Grew So Fast in the Early Universe

    How Supermassive Black Holes Grew So Fast in the Early Universe
    2026/01/24
    New research from Maynooth University sheds light on how supermassive black holes formed so quickly after the Big Bang. Advanced simulations show that small “light seed” black holes can grow rapidly through super-Eddington accretion in dense, gas-rich young galaxies.

    This process removes the need for exotic origins and fills a key gap in our understanding of galaxy evolution, with important implications for future gravitational-wave discoveries.
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    34 分
  • Habitable Worlds Observatory: Searching for Life Through Direct Exoplanet Imaging

    Habitable Worlds Observatory: Searching for Life Through Direct Exoplanet Imaging
    2026/01/22
    The Habitable Worlds Observatory is a planned space telescope designed to identify signs of life on distant planets by capturing direct images of their surfaces and atmospheres. To succeed, scientists argue the mission requires broad spectral capabilities and high resolution to detect specific color signatures, such as the "red edge" of vegetation or the distinct hues of ancient purple bacteria. These advanced technical specifications are necessary to differentiate true biological markers from deceptive mineral mimics like iron oxide or sulfur.

    By analyzing a wide range of light, the telescope could potentially uncover "green oceans" or other evidence of evolutionary stages similar to Earth's history. Ultimately, the project’s ability to find habitable worlds depends on securing the funding needed for such sensitive and precise instrumentation.
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    24 分
  • Binary Stars and Magnetars: Cracking the Mystery of Repeating Fast Radio Bursts

    Binary Stars and Magnetars: Cracking the Mystery of Repeating Fast Radio Bursts
    2026/01/20
    Using China’s Five-hundred-meter Aperture Spherical Telescope (FAST), astronomers have found strong evidence that some fast radio bursts originate in binary star systems. Nearly two years of observations of a repeating burst revealed extreme Faraday rotation, pointing to a nearby companion star.

    The data suggest a magnetar orbiting a sun-like star whose plasma periodically distorts the radio signal. This discovery offers one of the clearest clues yet to the origin of repeating FRBs, supporting the idea that interactions in double-star systems drive these powerful cosmic flashes.
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    26 分
  • SETI@home: How Millions of PCs Hunted for Alien Life

    SETI@home: How Millions of PCs Hunted for Alien Life
    2026/01/18
    For over 20 years, SETI@home turned millions of personal computers into a global supercomputer, analyzing massive radio data in the search for extraterrestrial intelligence.

    This pioneering crowdsourced project processed billions of potential signals, eventually narrowing them down to 100 top-priority targets. Today, scientists are using China's gigantic FAST telescope to re-observe these promising locations for signs of alien technology.

    While no breakthrough discovery has been made yet, SETI@home revolutionized the field by setting new sensitivity benchmarks and creating powerful algorithms to separate real signals from earthly interference.

    Join us as we explore how distributed computing and public participation forever changed modern astronomy!
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    28 分