  In this paper we consider the Fermi's paradox (FP) and propose a possible
resolution in the context of super-advanced alien civilizations. In this sense
it can be regarded as to be the weak Fermi paradox (WFP). By assuming that
superadvanced extraterrestrials (ET) exist and are capable of constructing a
huge ring-like megastructure around a pulsar or a main sequence star (MSS) to
consume its emitted energy, we consider the stability problem of the ring,
studying the out of plane dynamics. It has been shown that for normal pulsars
the oscillation timescale, thus the timescale of the spectral variability is of
the order of several days, whereas for MSS it can vary from minutes up to
hundreds of years. We have shown that by means of the high resolving power and
sensitivity, the European Southern Observatory's Very Large Telescope can
detect either cold ($T=300$ K) or hot ($T=4000$ K) megastructures throughout
the whole galaxy even for very small oscillation amplitudes of rings. As it is
shown the observed variability can have characteristics similar to those of
some other variables, which can be considered as one of the resolutions of the
WFP.
