What Do the Surveys of the Three-Dimensional Distribution of Groups

question 26

Multiple Choice

What do the surveys of the three-dimensional distribution of groups of galaxies reveal about how groups and clusters of galaxies are organized?

• A) galaxy groups are distributed completely evenly -- there is typically the same amount of space between them -- and so there is no structure evident
• B) galaxy groups make a huge spiral structure that resembles the Milky Way (but is much bigger)
• C) galaxy groups are organized into huge spherical "lumps" with concentric rings of groups of galaxies around each lump
• D) galaxy groups are organized into huge filaments with great voids between them -- something like the structure one would see taking a cross-section of some soap bubbles
• E) you can't fool me; astronomers cannot get any sense with our present-day instruments of how groups of galaxies are distributed on the large scale

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