section_path: History of exploration
section_name: History of exploration
paragraph_text: History of exploration
  
  Early world maps, like the 1513 Piri Reis map, feature the hypothetical continent Terra Australis. Much larger than and unrelated to Antarctica, Terra Australis was a landmass that classical scholars presumed necessary to balance the known lands in the northern hemisphere.
  
  Captain James Cook 's ships, HMS Resolution and Adventure, crossed the Antarctic Circle on 17 January 1773, in December 1773, and again in January 1774. Cook came within about 120 km (75 mi) of the Antarctic coast before retreating in the face of field ice in January 1773. In 1775, he called the existence of a polar continent "probable", and in another copy of his journal he wrote: " firmly believe it and it's more than probable that we have seen a part of it".