Unknown. The planet Venus is clearly visible in the sky, and prehistoric man could see it easily.
error
It was discovered in 1898.
Saturn was discovered on March 25, 1610 by Galileo Galilei.
He was discovered in 1891
1922 was the date that vegemite was discovered
Oxygen was discovered by Joseph Priestley in 1774. The exact date is August 1, 1774.
Protactinium was discovered in 1913 by Fajans and Gohring in Karlsruhe, Germany.
Antimatter was discovered in 1928 by Paul Dirac.
2013
1325
1609
2005