In the category "Space" we currently track items of 425 persons. The most popular ones, by number of traded items, are:

Richard TrulyHarrison SchmittGuion Bluford
Bill DanaVance BrandJames McDivitt
Robert CrippenPete ConradTom Stafford
John GlennBuzz AldrinMike Melvill
Gordon FullertonJerry CarrEd Gibson
Dave ScottJerry LinengerJim McDivitt
Scott CrossfieldHoot Gibson 

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