No one knows what an astrodimer is, dude.
ALL of them, except the Milky Way and the Andromeda galaxies.
The spectral lines from distant galaxies do not match those on Earth because of the Doppler effect, cosmic expansion, and differences in elements present in the galaxies. These factors cause the observed spectral lines to be shifted or altered compared to what we see on Earth.
See related questions.
You can see Earth, Mars, the Moon and galaxies!
The vast distances involved means that the light we see left those galaxies a long time ago.
The vast distances involved means that the light we see left those galaxies a long time ago.
They have broad emission lines of highly ionized elements.
No, Elements are the same everywhere in the Universe.
The closest ones near our galaxy.
Yes. See related question.
See related questions.
ummmm, galaxies can have galaxies in them unless they combine, also, we don't know, the universe is infinite and we have ye to see beyond our local galaxy cluster... sorry but that is an impossible question (although if the universe is infinite then nothing is quite impossible...)