Short-burst sources

Article Abstract:

The cosmological distance of the gamma-ray bursts and a support for the favored theoretical model for their origin is presented. Short gamma-ray bursts are the expression of the enormous energy released when two compact objects, remnants of exploded stars in the form of highly dense neutron star or black holes merge.

United States, Black holes (Astronomy), Gamma rays, Neutron stars

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Rapid evolution of the most luminous galaxies during the first 900 million years

Article Abstract:

The results of a search for galaxies at z= 7-8 about 700 Myr after the Big Band, using the deepest near-infrared and optical images ever taken is reported. The simplest explanation is that the Universe is just too young to have built up many luminous galaxies at z=7-8 by the hierarchical merging of small galaxies.

Discovery and exploration, Galaxies, Galactic evolution, Identification and classification, Star formation

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