Low-resolution intensity spectra of Earth's atmosphere obtained from space reveal strong signatures of life (`biosignatures'), such as molecular oxygen and...
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PublicationBiosignatures as revealed by spectropolarimetry of Earthshine
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PublicationBlack-hole-regulated star formation in massive galaxies
Supermassive black holes, with masses more than a million times that of the Sun, seem to inhabit the centres of all massive galaxies. Cosmologically motivated...
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PublicationBlazar spectral variability as explained by a twisted inhomogeneous jet
Blazars are active galactic nuclei, which are powerful sources of radiation whose central engine is located in the core of the host galaxy. Blazar emission is...
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PublicationCircular polarization in the optical afterglow of GRB 121024A.
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PublicationConfirmation and refutation of very luminous galaxies in the early Universe
During the first 500 million years of cosmic history, the first stars and galaxies formed, seeding the Universe with heavy elements and eventually reionizing...
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PublicationContinuous Spectrum of Taurus A at 1.2 mm Wavelength
WE have measured the radiation from the region of the Crab nebula (Taurus A) in a waveband centred at 1.2 mm (250 GHz) in the far infrared. Our equipment was an...
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PublicationCosmology: The lithium problem
The theory that predicts how the lightest elements formed after the Big Bang has hitherto failed to explain the amount of cosmic lithium. The detection of...
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PublicationDeficit of distant X-ray-emitting galaxy clusters and implications for cluster evolution
CLUSTERS of galaxies are the largest gravitationally bound systems in the Universe and therefore provide important constraints on the formation and evolution of...
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PublicationDirect observation of structure in the cosmic microwave background
Temperature fluctuations in the cosmic microwave background are a key prediction of cosmological models of structure formation in the early Universe. Ground...