Cluster Suicides, or mass suicide, is basically when a group of people, oftentimes influenced by a common belief, decide to all commit suicide together. (For an example, search Comet Hale-Bopp.)
A cluster suicide is a situation mostly found in adolescents, where a bunch of kids with issues have a friend commit suicide and they decide to follow their example. Then others in their peer group...
A repeated desire to commit suicide.
A group of suicides, grouped by time (all proximal to each other but not typically simultaneous) and grouped by association in a typically small, interactive...
The Coma cluster is one of the nearest clusters but it is not the nearest. At a mean distance of about 321 million light years the Virgo Cluster is closer at a mean distance of only 59 million light...