Gallo first proposed a heliocentric model of the solar system t or f

Both Copernicus and Galilei Galileo were ostrizied by the Chruch for the heliocentric model they both proposed and believed in.

true

The truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey