Wikipedia contributors. (2024, January 14). John Walter Gregory. In Wikipedia, The Free Encyclopedia. Retrieved January 14, 2024, from https://en.wikipedia.org/w/index.php?title=John_Walter_Gregory&oldid=1195499176
In spiral galaxies, open clusters are largely found in the spiral arms where gas densities are highest and so most star formation occurs, and clusters usually disperse before they have had time to travel beyond their spiral arm.
John Walter Gregory (Wikipedia) John Walter Gregory, FRS, FRSE, FGS (27 January 1864 – 2 June 1932) was a British geologist and explorer, known principally for his work on glacial geology and on the geography and geology of Australia and East Africa.