The planetary nebula stage is the ultimate fate of stars with masses one to eight times that of the Sun (). The origin of their complex morphologies is poorly...
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PublicationThe double-degenerate, super-Chandrasekhar nucleus of the planetary nebula Henize 2-428
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PublicationThe excitation of solar-like oscillations in a δSct star by efficient envelope convection
Delta Scuti (δSct) stars are opacity-driven pulsators with masses of 1.5-2.5Msolar, their pulsations resulting from the varying ionization of helium. In less...
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PublicationThe high optical brightness of the BlueWalker 3 satellite
Large constellations of bright artificial satellites in low Earth orbit pose significant challenges to ground-based astronomy 1. Current orbiting constellation...
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PublicationThe rapid assembly of an elliptical galaxy of 400 billion solar masses at a redshift of 2.3
Stellar archaeology shows that massive elliptical galaxies formed rapidly about ten billion years ago with star-formation rates of above several hundred solar...
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PublicationThe suppression of star formation by powerful active galactic nuclei
The old, red stars that constitute the bulges of galaxies, and the massive black holes at their centres, are the relics of a period in cosmic history when...
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PublicationThe X-ray counterpart to the gravitational-wave event GW170817
A long-standing paradigm in astrophysics is that collisions—or mergers—of two neutron stars form highly relativistic and collimated outflows (jets) that power γ...
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PublicationThree-dimensional magnetic field topology in a region of solar coronal heating
Flares and X-ray jets on the Sun arise in active regions where magnetic flux emerges from the solar interior amd interacts with the ambient magnetic field. The...
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PublicationToxic spill caught Spain off guard
Sir The toxic spill by the mining company Boliden into the Guadiamar River and the Doñana Natural Park last April highlighted the lack of co-ordination between...
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PublicationVisual Determination of the Mean Effective Chromospheric Thickness
IN the course of taking submillimetre chromospheric data from Concorde 001 during the eclipse of June 30 (ref. 1), it proved possible to record information on...