Want to live and die on Mars? Mars One has officially begun its worldwide search for astronauts who will fly to Mars in 2023—and never come back. The ultimate goal is to select 24 to 40 candidates who will travel to Mars in groups of four. Mars One wants to land the first group (two men and two women, ideally from four different continents, says CEO Bas Lansdorp) on the red planet in 2023, with the other groups following one at a time, every two years. Applications close August 31, 2013.