  Dark Matter (DM) being the vital ingredient in the cosmos, still remains a
mystery. Standard assumption is that the collisionless cold dark matter (CCDM)
particles are represented by some weakly interacting fundamental fields which
can not be associated with any standard quarks or leptons. However, recent
analyses of structure on galactic and sub-galactic scales have suggested
discrepancies and stimulated numerous alternative proposals including, e.g.
Self-Interacting dark matter, Self-Annihilating dark matter, Decaying dark
matter, to name just a few. We propose the alternative to the standard
assumption about the nature of DM particles (which are typically assumed to be
weakly interacting fundamental point -like particles, yet to be discovered).
Our proposal is based on the idea that DM particles are strongly interacting
composite macroscopically large objects which made of well known light quarks
(or even antiquarks). The required weakness of the DM particle interactions is
guaranteed by a small geometrical factor of the composite objects with a large
baryon charge rather than by a weak coupling constant of a new field. We argue
that the interaction between hadronic matter and composite dark objects does
not spoil the desired properties of the latter as cold matter. We also argue
that such a scenario does not contradict to the current observational data.
Rather, it has natural explanations of many observed data, such as
$\Omega_{DM}/ \Omega_{B}\sim 1$ or $511 KeV$ line from the bulge of our galaxy.
We also suggest that composite dark matter may modify the dynamics of structure
formation in the central overdense regions of galaxies. We also present a
number of other cosmological/astrophysical observations which indirectly
support the novel concept of DM nature.
