Kenneth; Irish astronomer, the first to propose the existence of a disk of bodies beyond the orbit of Neptune, now known as the Edgeworth-Kuiper Belt (1880-1972).
Bishun; Indian-born American atmosphere chemistry scientist, investigated, in particular, tholins, the organic molecules that probably account for the darkest regions on Pluto (1933–2013).
Jan Hendrik, Dutch astronomer, first described the Oort Cloud, a theoretical cloud of icy planetesimals beyond the Kuiper Belt, and believed to be the source of long- period comets (1900 to 1992).