In the category "Space" we currently track items of 431 persons. The most popular ones, by number of traded items, are:

Buzz AldrinJohn GlennRichard Truly
Harrison SchmittGuion BlufordVance Brand
Bill DanaJames McDivittPete Conrad
Robert CrippenTom StaffordNeil Armstrong
Gordon FullertonMike MelvillDave Scott
Ed GibsonJerry CarrJerry Linenger
Jim McDivittScott Crossfield 

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