Why Is the Coma Cluster of Galaxies a Favorite Among

question 191

Multiple Choice

Why is the Coma cluster of galaxies a favorite among astronomers?

• A) The Coma cluster is the cluster in which the Milky Way Galaxy is situated.
• B) The Coma cluster contains two quasars.
• C) The Coma cluster is the rich, regular cluster nearest Earth.
• D) The Coma cluster is the rich, irregular cluster nearest Earth.

---

Definitions:

Asthenosphere

The semi-fluid layer of the Earth's mantle just below the lithosphere, allowing for plate tectonic movement due to its plasticity.

Marine Sediments

Deposits accumulated on the ocean floor, derived from chemical precipitates, organic matter, or the erosion of terrestrial materials.

Black Smokers

Hydrothermal vents on the seafloor in which hot water from within the rock jets out into cold seawater and forms a cloud of minerals, especially those rich in sulfur.

Sulfide Minerals

Minerals composed of sulfide ions and one or more metals; important as ore minerals and for their chemical properties.