Caption: "This deep image (i.e., very long-exposure) of the Virgo Cluster (obtained by Chris Mihos and his colleagues using the Burrell Schmidt Telescope) shows the diffuse light between the galaxies belonging to the cluster. North is up, east to the left. The dark spots indicate where bright foreground stars were removed from the image. M87 (NGC 4486) is the largest galaxy in the picture (lower left)." (Slightly edited.)

Features:

1. The image shows only a part of the Virgo Cluster.

2. Virgo Cluster:
   1. has its center at 16.5(1) Mpc away.
   2. contains about 1300 to maybe 2000 galaxies.
   3. has mass of 1.2*10**15 M_Sun (counting dark matter???).
   4. has a shape that is a prolate filament about 4 times longer than it is wide (see Wikipedia: Virgo Cluster: Characteristics).
   5. has a characteristic radial velocity of about 1300 km/s assuming that the center of the Virgo Cluster is roughly near cD (or supergiant elliptical) galaxy M87 (NGC 4486) which has radial velocity 1307(7) km/s.
   6. has a characteristic radius of ∼ 2.2 Mpc.
   7. subtends 8° on the sky in its longest direction.

3. The Virgo Cluster is part of the Virgo Supercluster which also contains the Local Group which contains the Milky Way.

4. The blueness of the spiral arms of spiral galaxies is NOT enhanced in this image. Maybe the image makers didn't include the blue light.

5. Near the upper right center of the image there is a pair of interacting galaxies. You can tell by the distortion from flatness of the galactic disk of one of them.