Harry Harrison

core n.	1964 H. Harrison Final Encounter in Galaxy Magazine Apr. 150/2 Hautamaki pointed at the sky above them, at the star-filled sweep of the Milky Way, burning with massed stars. ‘There, far out there on the other side of the core, roughly half way around the lens of the galaxy.’
jumpspace n.	1961 H. Harrison Sense of Obligation in Analog Science Fact & Fiction Sept. 26/2 The ship was unchanged, only outside of the port was the red-shot blankness of jump space.