- Early turbulent mixing as the origin of chemical homogeneity in open star clustersThe abundances of elements in stars are critical clues to stars’ origins. Observed star-to-star variations in logarithmic abundance within an open star cluster—a gravitationally bound ensemble of stars in the Galactic plane—are typically only about 0.01 to 0.05 over many elements, which is noticeably smaller than the variation of about 0.06 to 0.3 seen in th
- Neutrinos from the primary proton–proton fusion process in the SunIn the core of the Sun, energy is released through sequences of nuclear reactions that convert hydrogen into helium. The primary reaction is thought to be the fusion of two protons with the emission of a low-energy neutrino. These so-called pp neutrinos constitute nearly the entirety of the solar neutrino flux, vastly outnumbering those emitted in the reacti
- A massive galaxy in its core formation phase three billion years after the Big BangMost massive galaxies are thought to have formed their dense stellar cores in early cosmic epochs. Previous studies have found galaxies with high gas velocity dispersions or small apparent sizes, but so far no objects have been identified with both the stellar structure and the gas dynamics of a forming core. Here we report a candidate core in the process of
- Probing excitonic dark states in single-layer tungsten disulphideTransition metal dichalcogenide (TMDC) monolayers have recently emerged as an important class of two-dimensional semiconductors with potential for electronic and optoelectronic devices. Unlike semi-metallic graphene, layered TMDCs have a sizeable bandgap. More interestingly, when thinned down to a monolayer, TMDCs transform from indirect-bandgap to direct-ba
- Quantum imaging with undetected photonsInformation is central to quantum mechanics. In particular, quantum interference occurs only if there exists no information to distinguish between the superposed states. The mere possibility of obtaining information that could distinguish between overlapping states inhibits quantum interference. Here we introduce and experimentally demonstrate a quantum imag
- Astrophysics: Supernova seen through γ-ray eyesObservations of γ-ray photons from a type Ia supernova indicate that stellar explosions of this kind get their energy from sudden thermonuclear fusion in the progenitor star. See Letter p.406
- 50 & 100 Years Ago
- Neutrino physics: What makes the Sun shineNeutrinos produced in the nuclear reaction that triggers solar-energy generation have been detected. This milestone in the search for solar neutrinos required a deep underground detector of exceptional sensitivity. See Article p.383
- Cobalt-56 γ-ray emission lines from the type Ia supernova 2014JA type Ia supernova is thought to be a thermonuclear explosion of either a single carbon–oxygen white dwarf or a pair of merging white dwarfs. The explosion fuses a large amount of radioactive 56Ni (refs 1–3). After the explosion, the decay chain from 56Ni to 56Co to 56Fe generates γ-ray photons, which are reprocessed in the expanding ejecta and give rise to
- Applied physics: Hybrid sensors ring the changesAn improved design for a class of magnetometer greatly increases the sensitivity of these devices — and might be the vanguard of a new generation of hybrid sensors that combine different types of signal to increase sensitivity.
- Early turbulent mixing as the origin of chemical homogeneity in open star clusters
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