  This study looks at motion of particles using mathematical methods of
chronometric invariants (physical observable values in General Relativity). It
is shown that aside for mass-bearing particles and light-like particles
"zero-particles" can exist in fully degenerated space-time (zero-space). For a
regular observer zero-particles move instantly, thus transferring long-range
action. Further we show existence of two separate areas in unhomogeneous
space-time, where observable time flows into future and into past, while this
duality is not found in homogeneous space-time. These areas are referred to as
our world, where time flows into future and as the mirror Universe, where time
flows in past. The areas are separated with a space-time membrane, referred to
as zero-space, where observable time stops.
