tachyons

I guess

gravity moves at an almost infinite speed - this can explain dark flow if
there is dark flow

because gravity moves at an almot infinite speed gravity will not have a
decrease of energy traveling through space that is expanding

photons may have a decrease of energy traveling through space that is
expanding

if space is expanding and if there is a big distance between people and
stars - it could be true people would not see light from stars - gravity
from stars would influence people

Kurt Stocklmeir