Daly, Reginald Aldworth
BornNapanee, Ontario, Canada, 18 March 1871
Died Cambridge, Massachusetts, USA, 19 September 1957
In 1948, Canadian geologist Reginald Daly proposed that the Moon was formed by a collision between the Earth and a planetary-mass body. By 1984, “giant impact” had become the leading theory for lunar origin.