Exploration is the act of searching for the purpose of discovery of information or resources. Exploration occurs in all non-sessile animal species, including humans. In human history, its most dramatic rise was during the Age of Discovery when European explorers sailed and charted much of the rest of the world for a variety of reasons. Since then, major explorations after the Age of Discovery have occurred for reasons mostly aimed at information discovery.
The Phoenicians (1550 BCE-300 BCE) traded throughout the Mediterranean Sea and Asia Minor though many of their routes are still unknown today. The presence of tin in some Phoenician artifacts suggests that they may have traveled to Britain. According to Virgil's Aeneid and other ancient sources, the legendary Queen Dido was a Phoenician from Tyre who sailed to North Africa and founded the city of Carthage.
The Romans organized expeditions to cross the Sahara desert with five different routes:
All these expeditions were supported by legionaries and had mainly a commercial purpose. Only the one done by emperor Nero seemed to be a preparative for the conquest of Ethiopia or Nubia: in 62 AD two legionaries explored the sources of the Nile river.
One of the main reasons of the explorations was to get gold using the camel to transport it.
The explorations near the African western and eastern coasts were supported by Roman ships and deeply related to the naval commerce (mainly toward the Indian Ocean). The Romans also organized several explorations into Northern Europe, and explored as far as China in Asia.
During the 2nd century BC, the Han dynasty explored much of the Eastern Northern Hemisphere. Starting in 139 BC, the Han diplomat Zhang Qian traveled west in an unsuccessful attempt to secure an alliance with the Da Yuezhi against the Xiongnu (the Yuezhi had been evicted from Gansu by the Xiongnu in 177 BC); however, Zhang's travels discovered entire countries which the Chinese were unaware of, including the remnants of the conquests of Alexander the Great (r. 336-323 BC). When Zhang returned to China in 125 BC, he reported on his visits to Dayuan (Fergana), Kangju (Sogdiana), and Daxia (Bactria, formerly the Greco-Bactrian Kingdom which had just been subjugated by the Da Yuezhi). Zhang described Dayuan and Daxia as agricultural and urban countries like China, and although he did not venture there, described Shendu (the Indus River valley of Northwestern India) and Anxi (Arsacid territories) further west.
From about 800 AD to 1040 AD, the Vikings explored Europe and much of the Western Northern Hemisphere via rivers and oceans. For example, it is known that the Norwegian Viking explorer, Erik the Red (950-1003), sailed to and settled in Greenland after being expelled from Iceland, while his son, the Icelandic explorer Leif Ericson (980-1020), reached Newfoundland and the nearby North American coast, and is believed to be the first European to land in North America.
Polynesians were a maritime people, who populated and explored the central and south Pacific for around 5,000 years, up to about 1280 when they discovered New Zealand. The key invention to their exploration was the outrigger canoe, which provided a swift and stable platform for carrying goods and people. Based on limited evidence, it is thought that the voyage to New Zealand was deliberate. It is unknown if one or more boats went to New Zealand, or the type of boat, or the names of those who migrated. 2011 studies at Wairau Bar in New Zealand show a high probability that one origin was Ruahine Island in the Society Islands. Polynesians may have used the prevailing north easterly trade winds to reach New Zealand in about three weeks. The Cook Islands are in direct line along the migration path and may have been an intermediate stopping point. There are cultural and language similarities between Cook Islanders and New Zealand Maori. Early Maori had different legends of their origins, but the stories were misunderstood and reinterpreted in confused written accounts by early European historians in New Zealand trying to present a coherent pattern of Maori settlement in New Zealand.
Mathematical modelling based on DNA genome studies, using state-of-the-art techniques, have shown that a large number of Polynesian migrants (100-200), including women, arrived in New Zealand around the same time, in about 1280. Otago University studies have tried to link distinctive DNA teeth patterns, which show special dietary influence, with places in or nearby the Society Islands.
The Chinese explorer, Wang Dayuan (fl. 1311-1350) made two major trips by ship to the Indian Ocean. During 1328-1333, he sailed along the South China Sea and visited many places in Southeast Asia and reached as far as South Asia, landing in Sri Lanka and India, and he even went to Australia. Then in 1334-1339, he visited North Africa and East Africa. Later, the Chinese admiral Zheng He (1371-1433) made seven voyages to Arabia, East Africa, India, Indonesia and Thailand.
The Age of Discovery, also known as the Age of Exploration, is one of the most important periods of geographical exploration in human history. It started in the early 15th century and lasted until the 17th century. In that period, Europeans discovered and/or explored vast areas of the Americas, Africa, Asia and Oceania. Portugal and Spain dominated the first stages of exploration, while other European nations followed, such as England, Netherlands, and France.
Important explorations during this period went to a number of continents and regions around the globe. In Africa, important explorers of this period include Diogo Cão (c.1452 -c.1486) who discovered and ascended the Congo River and reached the coasts of the present-day Angola and Namibia; Bartolomeu Dias (c. 1450-1500), who was the first European to reach the Cape of Good Hope and other parts of the South African coast.
Explorers of routes from Europe towards Asia, the Indian Ocean, and the Pacific Ocean, include Vasco da Gama (1460-1524), a navigator who made the first trip from Europe to India and back by the Cape of Good Hope, discovering the ocean route to the East; Pedro Alvares Cabral (c. 1467/68-c.1520) who, following the path of Gama, claimed Brazil and led the first expedition that linked Europe, Africa, America, and Asia; Diogo Dias, who discovered the eastern coast of Madagascar and rounded the corner of Africa; explorers such as Diogo Fernandes Pereira and Pedro Mascarenhas (1470-1555), among others, who discovered and mapped the Mascarene Islands and other archipelagos.
António de Abreu (c.1480-c.1514) and Francisco Serrão (14?-1521) led the first direct European fleet into the Pacific Ocean (on its western edges), through the Sunda Islands, reaching the Moluccas. Andres de Urdaneta (1498-1568) discovered the maritime route from Asia to the Americas.
Explorations of the Americas began with the initial discovery of America by Christopher Columbus (1451-1506), who led a Castilian (Spanish) expedition across the Atlantic, discovering America. After the discovery of America by Columbus, a number of important expeditions were sent out to explore the Western Hemisphere. This included Juan Ponce de León (1474-1521), who discovered and mapped the coast of Florida; Vasco Núñez de Balboa (c. 1475-1519), who was the first European to view the Pacific Ocean from American shores (after crossing the Isthmus of Panama) confirming that America was a separate continent from Asia; Aleixo Garcia (14?-1527), who explored the territories of present-day southern Brazil, Paraguay and Bolivia, crossing the Chaco and reaching the Andes (near Sucre).
Álvar Núñez Cabeza de Vaca (1490-1558) discovered the Mississippi River and was the first European to sail the Gulf of Mexico and cross Texas. Jacques Cartier (1491-1557) drew the first maps of part of central and maritime Canada; Francisco Vázquez de Coronado (1510-1554) discovered the Grand Canyon and the Colorado River; Francisco de Orellana (1511-1546) was the first European to navigate the length of the Amazon River.
Ferdinand Magellan (1480-1521), was the first navigator to cross the Pacific Ocean, discovering the Strait of Magellan, the Tuamotus and Mariana Islands, and achieving a nearly complete circumnavigation of the Earth, in multiple voyages, for the first time. Juan Sebastian Elcano (1476-1526), completed the first global circumnavigation.
In the second half of the 16th century and the 17th century exploration of Asia and the Pacific Ocean continued with explorers such as Andrés de Urdaneta (1498-1568), who discovered the maritime route from Asia to the Americas; Pedro Fernandes de Queirós (1565-1614), who discovered the Pitcairn Islands and the Vanuatu archipelago; Álvaro de Mendaña (1542-1595), who discovered the Tuvalu archipelago, the Marquesas, the Solomon Islands and Wake Island.
Explorers of Australia included Willem Janszoon (1570-1630), who made the first recorded European landing in Australia; Yñigo Ortiz de Retez, who discovered and reached eastern and northern New Guinea; Luis Váez de Torres (1565-1613), who discovered the Torres Strait between Australia and New Guinea; Abel Tasman (1603-1659), who explored North Australia, discovered Tasmania, New Zealand and Tongatapu.
In North America, major explorers included Henry Hudson (156?-1611), who explored the Hudson Bay in Canada; Samuel de Champlain (1574-1635), who explored St. Lawrence River and the Great Lakes (in Canada and northern United States); and René-Robert Cavelier, Sieur de La Salle (1643-1687), who explored the Great Lakes region of the United States and Canada, and the entire length of the Mississippi River.
Long after the golden age of discovery, other explorers completed the world map, such as various Russians explorers, reaching the Siberian Pacific coast and the Bering Strait, at the extreme edge of Asia and Alaska (North America); Vitus Bering (1681-1741) who in the service of the Russian Navy, explored the Bering Strait, the Bering Sea, the North American coast of Alaska, and some other northern areas of the Pacific Ocean; and James Cook, who explored the east coast of Australia, the Hawaiian Islands, and circumnavigated the Antarctic continent.
There were still significant explorations which occurred well into the modern age. This includes the Lewis and Clark expedition (1804-1806), an overland expedition dispatched by President Thomas Jefferson to explore the newly-acquired Louisiana Purchase and to find an interior aquatic route to the Pacific Ocean, along with other objectives to examine the flora and fauna of the continent. In 1818, the British researcher Sir John Ross was the first to find that the deep sea is inhabited by life when catching jellyfish and worms in about 2,000 m (6,562 ft) depth with a special device. The United States Exploring Expedition (1838-1842) was an expedition sent by President Andrew Jackson, in order to survey the Pacific Ocean and surrounding lands.
The extreme conditions in the deep sea require elaborate methods and technologies to endure them. In the 20th century, deep-sea exploration advanced considerably through a series of technological inventions, ranging from the sonar system, which can detect the presence of objects underwater through the use of sound, to manned deep-diving submersibles. In 1960, Jacques Piccard and United States Navy Lieutenant Donald Walsh descended in the bathyscaphe Trieste into the deepest part of the world's oceans, the Mariana Trench. In 2018, DSV Limiting Factor, piloted by Victor Vescovo, completed the first mission to the deepest point of the Atlantic Ocean, diving 8,375 m (27,477 ft) below the ocean surface to the base of the Puerto Rico Trench. With the advent of satellite imagery and aviation, exploration of the surface of Earth has largely ceased, however the culture of many disconnected tribes still remain undocumented and left to be explored. Urban exploration is the exploration of manmade structures, usually abandoned ruins or hidden components of the manmade environment.
Humanity is continuing to follow the impulse to explore, moving beyond Earth. Space exploration started in the 20th century with the invention of exo-atmospheric rockets. This has given humans the opportunity to travel to the Moon, and to send robotic explorers to other planets and far beyond.
A 2015 study, performed on mobile phone data and on GPS tracks of private vehicles in Italy, demonstrated that individuals naturally split into two well-defined categories according to their mobility habits, dubbed "returners" and "explorers". "Explorers" showed a star-like mobility pattern: they have a central core of locations (composed by home and work places) around which distant core of locations gravitates.