An ultralight scalar boson with mass m _ { 1 } \simeq 10 ^ { -22 } eV is gaining credence as a Dark Matter ( DM ) candidate that explains the dark cores of dwarf galaxies as soliton waves .
Such a boson is naturally interpreted as an axion generic in String Theory , with multiple light axions predicted in this context .
We examine the possibility of soliton structures over a wide range of scales , accounting for galaxy core masses and the common presence of nuclear star clusters .
We present a diagnostic soliton core mass-radius plot that provides a global view , indicating the existence of an additional axion with mass m _ { 2 } \simeq 4 \times 10 ^ { -20 } eV , with the possibility of a third axion with mass m _ { 3 } \gtrsim 6 \times 10 ^ { -18 } eV .