科学者チームが南極の氷床から最大8万年前の鉄60の痕跡を検出しました。これは太陽系が古代の恒星爆発による物質の中を移動していることを示しています。この研究成果は「フィジカル・レビュー・レターズ」誌に掲載され、放射性同位体の供給源として局所星間雲が挙げられています。
ヘルムホルツ・ドレスデン・ロッセンドルフ研究所を中心とする国際研究チームは、欧州のEPICAプロジェクトを通じて採取された氷床コアの分析を行いました。4万年から8万年前に形成されたこれらのサンプルには、より新しい時代の測定値よりも低い濃度の鉄60が含まれていました。この同位体は超新星爆発でのみ形成されるもので、以前にも新しい雪や堆積物から見つかっていましたが、その起源はこれまで明らかではありませんでした。
Physicists at the University of Massachusetts Amherst propose that a record-breaking neutrino detected in 2023 originated from the explosion of a primordial black hole carrying a 'dark charge.' The particle's energy, 100,000 times greater than that produced by the Large Hadron Collider, puzzled scientists since only the KM3NeT experiment recorded it. Their model, published in Physical Review Letters, could also hint at the nature of dark matter.
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New research from Rutgers University reveals that meltwater from Antarctic ice shelves contributes far less iron to surrounding ocean waters than scientists had assumed. Instead, most iron originates from deep ocean water and continental sediments. The findings challenge expectations about iron fertilization and its role in carbon absorption.
Astronomers using China's Einstein Probe telescope have observed a powerful X-ray flash that matches the predicted signature of a 'dirty fireball,' a theorized explosion from a dying massive star. The event, labeled EP241113a, originated from a galaxy about 9 billion light years away. This detection could reveal new details about how massive stars end their lives.
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Researchers at Curtin University have developed a technique using krypton gas in microscopic zircon crystals to track the history of Earth's landscapes over millions of years. The method, which relies on cosmic rays striking surface minerals, reveals how erosion and sediment movement have shaped terrains in response to climate and tectonic changes. This approach could also aid in locating mineral deposits in Australia.
Astronomers using the Hubble Space Telescope observed comet C/2025 K1 (ATLAS) shortly after it split into four fragments, thanks to a lucky scheduling change. The high-resolution images provide unprecedented detail on the event. Researchers noted an unexpected delay in the comet's brightening after the breakup.