In the category "Space" we currently track items of 367 persons. The most popular ones, by number of traded items, are:

Charlie DukeChuck YeagerHarrison Schmitt
Guion BlufordRobert CrippenEd Charles
James McDivittJ.T. ThomasJerry Carr
Scott CrossfieldEd BookMichael Coats
Joe KittingerJames VanJ.R. Richard
Joe EngleBruce McCandlessStory Musgrave
Mike MullaneDick Gordon 

You can find all people that we're currently tracking items for in the alphabetical index:
A    B    C    D    E    F    G    H    J    K    L    M    N    O    P    R    S    T    V    W    Y