Hello,

as a layman I'm interested in the universe.

My question is:

If I shoot (by an imaginairy explosion) an imaginairy galaxy system X from
Earth into some direction into space with a speed that causes that galaxy X
having the same redshift as a galaxy B who's redshift suggests it's at a
distance of 13 Billion lightyears from Earth, will the relative speed
between galaxy X and galaxy Y be zero? Or is this a wrong way of thinking,
because galaxy X is MOVING THROUGH the expanding space while galaxy Y is
('stationary' in, and) PART OF the expanding space?

Regards,

Henk