One of the Recently Discovered Components of Clusters of Galaxies

question 293

Multiple Choice

One of the recently discovered components of clusters of galaxies that may have some bearing on the dark matter problem is:

• A) large numbers of cool, dark, brown dwarf stars, previously unknown, in the galaxies.
• B) X-ray measurements of substantial amounts of very hot intergalactic gas in clusters.
• C) a tremendous flux of neutrinos, which have recently been shown to have mass, coming from these clusters.
• D) large numbers of small but massive black holes within every galaxy.

---

Definitions:

Inflammatory Responses

The body's defense mechanism against infection or injury, characterized by redness, swelling, heat, and pain.

Cryotherapy

The use of extreme cold in medical therapy to treat a variety of tissue lesions and reduce pain and inflammation.

Muscle Spasm

Involuntary contraction of a muscle that can cause pain and interfere with function.

Nerve Conduction

The process by which electrical impulses are transmitted through the neurons in the nervous system.