The new galaxies are just 250 millions of light years away from us. That is, they are in our galactic neighborhood.
The Galaxy 92's technological detail by the experts of ired.gr:
The "new" galaxies are not a few, they are 883 on the number.
Scientists knew that something was hiding in this area. Some of the brightest galaxies were discernible, and since the 70' we know that the Milky Way is being pulled by some mysterious space bodies near us.
How did they manage to stay hidden for so long?
-The responsibility lies with our galaxy.
The Milky Way is full of stars, light and nebulae. This prevents us from seeing what lies behind the Our Galaxy. To overcome the obstacles, the astronomers used a radio telescope in combination with a new receiver, built specifically for this "exploration".
from jericho