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X-ray interferometers with resolutions from 100μas down to sub-μas can address a wide range of fundamental physical and astrophysical questions, ranging from powerful explorations of General Relativity, accurate measurement of fundamental parameters, to the imaging of accretion inflows and outflows, ...
Redshift determination via resonance absorptionThe observational use of nuclear resonance absorption for GRB redshift determination depends on two critical questions: “Is there enough matter along the sight lines to GRBs?”, and “Is the resulting absorption detectable?”. Is there enough matter alon...