Talk:Virgo Supercluster

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[edit] Apparent size criterion

What is considered "large" apparent size? Ardric47 02:17, 20 March 2006 (UTC)

There's some arbitrary cut-off in terms of angular size: 100 arcseconds. I modelled our list after the one in http://www.atlasoftheuniverse.com/galaclus.html, which also uses this cut-off. It keeps the listing from including heavy but very distant clusters that have been relatively poorly observed. -- Xerxes 01:35, 22 March 2006 (UTC)

[edit] Great attractor

"The local (Coma-Virgo), Perseus-Piscus, Hydra-Centaurus, Orphiuchus, Vela, and a number of other superclusters are observed to move towards the Great Attractor as speeds of greater than 600,000 km per second," Isn't this about 3 times the speed of light?

It's twice the speed of light. Although it's possible for different parts of the universe to be moving away from each other at faster-than-light speeds (by some definitions) due to the expansion of space, I'm suspicious about that happening so close to us. Ardric47 00:17, 22 March 2006 (UTC)

You don't want to know. Or maybe you do. This might possibly be harnessed somehow for future spaceships. This is better than an Scramjet!--Mac Lover ^Talk 17:15, 10 August 2006 (UTC)

[edit] Group/cluster list

The group/cluster member list is a mess. Moreover, this list gets really messy when considering the difficulty in identifying whether galaxies are parts of groups (see the Sombrero Galaxy under "Environment") and the difficulty in distinguishing whether galaxies are subdivided into small groups or combined together into large groups (see my revisions to the M101 Group article and the section labelled "Nearby groups"). This section could be misleading or confusing, and its accuracy will always be questionable, so I am removing the section. GeorgeJBendo 21:21, 28 October 2006 (UTC)