In the category "Space" we currently track items of 369 persons. The most popular ones, by number of traded items, are:

John GlennGene CernanEdgar Mitchell
Jim IrwinAl WordenBob Crippen
Michael CollinsWalt CunninghamRichard Gordon
Chuck YeagerEd CharlesJ.T. Thomas
Jerry CarrScott CrossfieldEd Book
Michael CoatsJoe KittingerDave Scott
James VanJoe Engle 

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