It is the largest galaxy visible from the Earth, in terms of the area of the night sky covered.

The total amount of hot gas is five to ten times the total mass in the visible galaxies.

There are many galaxies visible in telescopes with red shift numbers of 1.4 or higher.

What is the dark matter that enfolds the visible galaxies?

Note: the smaller galaxies visible in the image are in the distant background; they are not satellites.

Her measurements indicated that these dark halos outweighed the visible galaxies themselves from 5 to 10 times.

Noting that dark matter heavily outweighed the visible galaxies, four astronomers analyzed the results of an earlier galaxy mapping project, in 1980.

The gravity of the visible galaxies in the cluster would be far too small for such fast orbits, so something extra was required.

The Cosm was alight and afroth with fire now, the churn of great galaxies visible to the eye.

However, the lensing is strongest in two separated regions near (possibly coincident with) the visible galaxies.