SIRIUS is the synchrotron light source of Centro Nacional de Pesquisa em Energia e Materiais (CNPEM), operated by the Brazilian Synchrotron Light Laboratory (LNLS). It is a 3 GeV diffraction-limited storage ring designed to deliver highly brilliant, stable, and coherent X-ray beams to a diverse suite of beamlines dedicated to imaging, scattering, spectroscopy, and time-resolved experiments. This contribution presents an overview of the facility, its design principles, and its experimental capabilities, highlighting opportunities enabled by multiscale and in situ/operando approaches. Particular attention is given to research on porous and heterogeneous materials, where synchrotron X-ray methods provide strong complementarity to Magnetic Resonance techniques by accessing pore architecture, structural and chemical heterogeneity, interfaces, and their evolution under realistic conditions. Together, these capabilities position SIRIUS as a platform for integrated, cross-scale studies of complex materials and transport processes.