Redshift surveys have revealed the largest structures yet
observed in the Universe. The prominent concentration of galaxies running
diagonally across the northern (that is, upper) portion of the adjacent image
has been termed the Great Wall. It appears that
Preliminary deep space redshift surveys along
narrow pencils of direction indicate a periodic structure suggesting that there
may be additional Great Wall type structures out there, but we have insufficient
information at this point to map them extensively.
- It covers at least 85 Mpc in declination and 215 Mpc in right ascension.
It is likely to be even larger because it is obscured by dust in the plane of
our galaxy on one end and hasn't yet been mapped on the other.
- It is less than 7 Mpc thick.
- There is a corresponding structure in the southern sky termed the
Southern Wall. Because neither the Northern Wall nor the Southern
Wall have been mapped fully, it is even possible that the two join each other
in the parts of the sky that have not been examined yet and are part of one
much larger structure.