The compact source SgrA* that can be associated with the massive
black hole at the center of the Milky Way shows a strong variability
from the radio to the X-ray wavelength domain.
Here report on the latest (May 2008, May 2007 and the years before)
observations using the NACO adaptive optics (AO) instrument at the
European Southern Observatory's Very Large Telescope,
the Australian Telescope Compact Array, the US mm-array CARMA
and other telescopes.We interpret the results
using a model in which spots in an accretion disk are on
relativistic orbits around SgrA*.
We discuss the energy release from the X-rays to the radio domain
in the framework of adiabatically expanding source components
and consider the possibility of a jet or outflow from such a
central accretion disk.