  Uncertainties of the MSSM predictions are due to an unknown SUSY breaking
mechanism. To reduce these uncertainties, one usually imposes constraints on
the MSSM parameter space. Recently, two new constraints became available, both
from astrophysics: WMAP precise measurement of the amount of the Dark Matter in
the Universe and EGRET data on an excess in diffuse gamma ray flux. Being
interpreted as a manifestation of supersymmetry these data lead to severe
constraints on parameter space and single out a very restricted area. The key
feature of this area is the splitting of light gauginos from heavy squarks and
sleptons. We study the phenomenological properties of this scenario, in
particular, the cross-sections of superparticle production, their decay
patterns and signatures for observation at hadron colliders, Tevatron and LHC.
We found that weakly interacting particles in this area are very light so that
the cross-sections may reach fractions of a pb with jets and/or leptons as
final states accompanied by missing energy taken away by light neutralino with
a mass around 100 GeV.
