A cometary gas ensemble, the Smith cloud (SC), has been observed in advance accretion onto the
Milky Way plane. Portions of it were first mapped as an extension of the Galactic H I structure.
However, it was discovered that its position in function of its velocity doesn’t comply with a simple
model of differential galactic rotation. It was then classified as a High Velocity Cloud, a section of
circumgalactic clouds thought to supply star-making fuel. To this day the origin remains a mystery,
partly due to the interpretations behind its half solar metallicity and dynamical history that predicts it previously passed through the Milky Way about 70 Myr ago. We argue that an encapsulating DM halo remains a viable hypothesis for the SC to remain coherent post-passage but it’s more likely that it’s extragalactic and had gone through circumstantial mixing. We also discuss the thermodynamic
assumptions from DM particle annihilation to start inquiring about how far we can model the
virialized DM halo as a virialized globular cluster for future research.