Who is the greatest explorer of the 20th century?

By 1900 the map had few blanks left, so the century's explorers went for the poles, the peaks, the trenches and orbit. Rank them.

1. 1
   Neil Armstrong

   Stepped onto the Moon on 20 July 1969.
   1000pts
2. 2
   Yuri Gagarin

   Orbited the Earth once on 12 April 1961, the first human to leave it.
   673pts
3. 3
   Tenzing Norgay

   Summited Everest alongside Hillary after six previous expeditions on the mountain.
   604pts
4. 4
   Roald Amundsen

   Reached the South Pole first in December 1911 and sailed the Northwest Passage before that.
   524pts
5. 5
   Amelia Earhart

   Flew routes nobody had flown alone, and died attempting the longest of them.
   443pts
6. 6
   Jacques Cousteau

   Co-invented the aqua-lung and spent forty years filming what was under the surface.
   443pts
7. 7
   Gertrude Bell

   Mapped and travelled the Arabian deserts and helped draw the borders of modern Iraq.
   443pts
8. 8
   Ernest Shackleton

   Failed to cross Antarctica and brought all twenty-seven men home anyway.
   349pts
9. 9
   Edmund Hillary

   Reached the summit of Everest with Tenzing Norgay on 29 May 1953.
   349pts
10. 10
    Jacques Piccard

    Descended to the bottom of the Mariana Trench in the Trieste in 1960.
    238pts
11. 11
    Robert Falcon Scott

    Reached the South Pole a month after Amundsen and died on the way back.
    238pts