Why alignment matters for seeing across the universe HiZ-GUNDAM’s X-ray monitor relies on lobster-eye optics, a design inspired by the compound eyes of crustaceans. Instead of a single curved mirror, ...

Gamma-ray bursts (GRBs) rank among the most powerful explosions in the Universe, releasing immense energy in intense flashes of gamma rays. The most distant GRBs originate from the era when the first ...

Free-electron lasers and high-harmonic-generation table-top systems are new sources of extreme-ultraviolet to hard X-ray photons, providing ultrashort pulses that are intense, coherent and tunable.

We establish an intuitive connection between transformation optics (TO) and the classical invariants of étendue and radiance. Through explicit application of the optical-metric formulation of TO, we ...