  According to the Special Theory of Relativity, there should be no resting
frame in our universe. Such an assumption, however, could be in conflict with
the Standard Model of cosmology today, which regards the vacuum not as an empty
space. Thus, there is a strong need to experimentally test whether there is a
resting frame in our universe or not. We propose that this can be done by
precisely measuring the masses of two charged particles moving in opposite
directions. If all inertial frames are equivalent, there should be no
detectable mass difference between these two particles. If there is a resting
frame in the universe, one will observe a mass difference that is dependent on
the orientation of the laboratory frame. The detailed experimental setup is
discussed in this paper.
