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The continent of Africa represented for many centuries a great mystery to the rest of the World. Its vast lands remained uncharted all up to late years of 19th century, when many European countries became invested into colonization of this continent. Beginning of this sudden European invasion process was made possible by the discoveries of many 19th century explorers (most notably David Livingstone and Henry Morton Stanley), as well by the efforts of much older explorers from Ancient Greece and Rome.
He traveled several times exploring the eastern coast of Africa paving the way for future Portuguese discoveries. Diogo Cao's discoveries were instrumental in the Vasco De Gama's famous first journey to the India.
Early years of 20th century are today remembered as one of the most exciting times for the explorers. In that short 25-year period, several important scientific journeys left their mark in the polar snows and history of the world. That time-period is today known as "Heroic Age of Polar Exploration".
In the last 50 years, space explorers brought us some of the greatest discoveries in human history. From the first human in space, to the first steps on the moon, brave space explorers continue to amaze us with their expeditions in the dark and inhospitable environment of Space.