エピソード

  • New “Super-Earth” Found in the Habitable Zone

    New “Super-Earth” Found in the Habitable Zone
    2025/11/01
    Astronomers have discovered GJ 251 c, a “super-Earth” nearly four times our planet’s mass, orbiting in its star’s habitable zone — the sweet spot for liquid water and possibly life. Using 20 years of data and tools like the Habitable-Zone Planet Finder, researchers from Penn State tracked the star’s subtle wobble to confirm the planet’s presence.

    While we can’t yet study its atmosphere, future telescopes may reveal whether GJ 251 c holds signs of alien life.
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    27 分
  • What’s Really Holding Back Space-Based Solar Power?

    What’s Really Holding Back Space-Based Solar Power?
    2025/10/30
    A new study reveals that the biggest barrier to space-based solar power isn’t in orbit—it’s on Earth. Researchers found that while thousands of satellites could technically beam solar energy from geostationary orbit, real-world factors like limited land for rectennas near the equator sharply reduce that number.

    Even so, the analysis shows SBSP could still provide up to 3% of global power, underscoring its potential as a future clean energy source.
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    29 分
  • How Cosmic Dust May Have Delivered the Building Blocks of Life to Earth

    How Cosmic Dust May Have Delivered the Building Blocks of Life to Earth
    2025/10/28
    In this episode, we explore new research from the Monthly Notices of the Royal Astronomical Society revealing how cosmic dust may have carried the building blocks of life to early Earth.

    Scientists simulated space conditions and found that amino acids like glycine and alanine could survive by clinging to silicate dust grains—tiny interstellar travelers that may have seeded our planet with the precursors for life.

    Tune in to uncover how these microscopic particles might have shaped Earth’s first chemistry.
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    25 分
  • MIT Geologists Uncover Traces of Earth’s Primordial Origins

    MIT Geologists Uncover Traces of Earth’s Primordial Origins
    2025/10/24
    MIT scientists have found the first direct evidence of material from the original “proto-Earth” — the planet that existed before the giant impact that formed our world 4.5 billion years ago.

    By detecting an unusual potassium-40 isotope imbalance in ancient rocks from Greenland and Hawaii, researchers revealed remnants of Earth’s earliest building blocks — material that even meteorites don’t fully capture.
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    30 分
  • The Core of the Problem: Why Our Magnetic Field is Weakening

    The Core of the Problem: Why Our Magnetic Field is Weakening
    2025/10/22
    The Earth's protective magnetic field is changing. Data from the ESA Swarm mission reveals that the South Atlantic Anomaly, a vast weak spot in our planetary shield, is expanding and rapidly weakening. Learn what's causing this shift—and why it matters for our satellites and technology.
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    23 分
  • Black Holes as Dark Matter Detectors: A New Window into the Invisible Universe

    Black Holes as Dark Matter Detectors: A New Window into the Invisible Universe
    2025/10/20
    A new study in Physical Review Letters proposes a groundbreaking way to detect dark matter using images from the Event Horizon Telescope (EHT). Researchers found that the dark shadows of black holes could act as natural detectors for faint signals produced by dark matter annihilation.

    By comparing simulated plasma emissions with these potential dark matter patterns, the team developed a morphological method to test its presence — offering a powerful new tool that could redefine how we search for the universe’s most mysterious substance.
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    30 分
  • Nickel and Urea May Explain Why Earth’s Oxygen Took So Long to Rise

    Nickel and Urea May Explain Why Earth’s Oxygen Took So Long to Rise
    2025/10/17
    In this episode, we uncover new research from Okayama University that sheds light on the delayed Great Oxidation Event.

    Scientists found that early ocean levels of nickel and urea controlled the growth of oxygen-producing cyanobacteria—sometimes fueling them, sometimes holding them back. When these elements declined, Earth’s atmosphere finally filled with oxygen, reshaping the planet and offering clues for spotting life on other worlds.
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    28 分
  • AI Breakthrough: Gemini Finds Real Cosmic Signals with Minimal Data

    AI Breakthrough: Gemini Finds Real Cosmic Signals with Minimal Data
    2025/10/15
    27 分