allgemeinerelativitätstheorie astronomicalinstruments astrophysics atoms blackholes(astronomy) congresses cosmology detectors experiments generalrelativity(physics) generalrelativity(pphysics) gravimeters(geophysicalinstruments) gravitation gravitationalcollapse gravity history instruments interferometry laserinterferometers measurement nuclearastrophysics pulsars quantumgravity quantumoptics radiation research researchinreducedgravityenvironments science socialaspects spaceandtime stars