Stories by Riccardo Giacconi

This satellite, carrying an X-ray telescope of unprecedented size and sensitivity, has been aloft for more than a year. It has yielded dramatic new views of high-energy phenomena in the universe

Rocket-borne instruments have detected a number of objects that are intense emitters of X rays. One of them is a star that produces as much energy in the form of X rays as the sun does at all wavelengths