All articles tagged with #isotopes
New isotopic analyses of meteorites and early Earth rocks indicate Earth formed predominantly from material from the inner Solar System, with Jupiter’s gravity acting as a barrier that limited outer-Solar-System material; the planet’s overall isotopic composition is homogeneous, while water (and some carbon) likely arrived later from outer-body sources.
New JWST/NIRSpec analysis of interstellar comet 3I/ATLAS finds an unusually low carbon-13 to carbon-12 ratio and significant deuterium enrichment, implying it formed very early in the Milky Way’s history. Modeling suggests 3I/ATLAS may be 10–12 billion years old, potentially originating from a thick-disk star system, making it one of the oldest interstellar visitors and perhaps a relic from a vanished stellar neighborhood. The age estimate is not yet peer‑reviewed and is available via a preprint, with researchers noting ongoing uncertainty but tantalizing clues about ancient planet formation beyond our galaxy.
Scientists studying water moving through the 400-million-year-old Equisetum horsetail found an extreme oxygen-isotope signature never observed in terrestrial samples, suggesting evaporation-driven isotope enrichment and prompting a rethink of how fossil phytoliths are used to reconstruct ancient climates.
A study led by Zachary Sharp shows the prehistoric smooth horsetail (Equisetum laevigatum) distills water so aggressively that its top-water oxygen-isotope signature resembles a meteorite, helping explain puzzling desert data. The researchers also show fossil phytoliths trap these integrated isotopic records, providing a sensitive palaeo-hygrometer to reconstruct Earth’s past humidity and climate millions of years ago, aided by a refined evaporation–isotope model; findings published in PNAS (2025).
James Webb Space Telescope analysis of interstellar comet 3I/ATLAS suggests it formed in a cold region of the Milky Way about 10–12 billion years ago, potentially making it older than Earth and possibly as old as the galaxy or even the universe. Its isotopic composition differs from solar-system comets, implying formation in a different stellar environment. The comet is now exiting the solar system after a close approach to Earth, with further travels past the outer planets as researchers continue to refine its origins.
NASA’s OSIRIS-REx samples from the 4.6-billion-year-old asteroid Bennu reveal amino acids, including glycine, can form in space and may arise in icy, radiation-exposed conditions in the early Solar System rather than only in liquid water; this suggests multiple pathways for the building blocks of life and shows Bennu’s isotopic signatures differ from the Murchison meteorite, indicating diverse origins for prebiotic molecules.
A multi-isotope analysis of Neolithic mass graves in Alsace, France, suggests Europe’s earliest violent encounters were deliberate rituals: local enemies were dismembered as trophies, while captives from farther regions were executed in public displays, indicating violence served political theater to assert dominance and shape group identity.
A NASA-led study of Apollo-era lunar regolith using triple oxygen isotope analysis finds only a small fraction of Earth's ocean water could have been delivered by meteorites over the past four billion years, challenging the long-held view that late meteorite impacts were the primary source of Earth's oceans.
A new study argues that Martian dust storms generate electrostatic discharges that create high-energy electrons, driving reactions between atmospheric CO2 and ground chloride salts to form perchlorates and carbonates without liquid water. This electrochemical pathway also explains the observed isotopic imbalances, with lighter isotopes preferentially involved in these reactions. The research, demonstrated in lab chambers simulating Mars’ environment, suggests electrical processes are a key driver of Mars’ surface chemistry, poses ongoing challenges for future missions (due to perchlorates), and may have parallels on other dusty worlds.
A Nature Communications study shows Mo-84 and Mo-86 near the proton–neutron balance line (N≈Z) exhibit an island of inversion, with protons and neutrons engaging in particle-hole excitations that deform the nucleus. Using Be targets and Mo-92 beams, gamma rays were detected by GRETINA and TRIPLEX, revealing symmetry-breaking structure in these proton-rich isotopes—a finding that challenges traditional nuclear models and expands where inversions can occur.
A new analysis of dust from the Moon’s far side collected by China’s Chang’e-6 mission finds heavier potassium isotopes than near-side samples, suggesting the South Pole–Aitken impact heated the Moon so intensely that lighter isotopes vaporized and escaped, reshaping the Moon’s mantle and leaving long-lasting hemispheric chemical differences and possibly triggering deep interior processes.
A study analyzing oxygen isotopes in rocks sampled by NASA's Curiosity Rover suggests that 3.7 billion years ago, Gale Crater on Mars had a warm, dry environment with significant evaporation, providing insights into the planet's past habitability and water cycle.
Astronomers discovered rare isotopes of methanol in the gas around the young star HD 100453, providing insights into the organic ingredients available for planet formation and the potential origins of life, with implications for understanding how complex molecules necessary for life may develop in star systems.
A rare dust particle found in an ancient meteorite has been determined to be older than the Sun, with a composition indicating it originated from an unusual type of supernova. The grain's isotopic ratios suggest it was formed by a hydrogen-burning supernova, a rare type of Type II supernova. This discovery provides valuable insights into the formation of the Solar System and the types of stars that contributed to its composition.
Physicists at the Institute of Modern Physics and collaborators have discovered two new isotopes, osmium-160 and tungsten-156, challenging traditional views on nuclear stability and magic numbers. This breakthrough suggests potential for lead-164 to be a stable, doubly magic nucleus, enhancing the understanding of nuclear physics and the architecture of atomic nuclei. The study, published in Physical Review Letters, indicates a significant step forward in nuclear theory and stability, with implications for the development of nuclear forces and deepening our understanding of nuclear physics.