Measurement of Structure in the Cosmic Microwave Background Radiation Has

question 138

Multiple Choice

Measurement of structure in the cosmic microwave background radiation has recently indicated that we live in a flat universe between a closed and an open universe,and yet the measured density of detected matter and radiation is only 20-40% of the critical density required for a flat universe.In what form is the other 60-80% of the "matter" thought to be?

• A) myriads of small primordial black holes whose gravitational effects are spread throughout the universe and that emit no radiation
• B) dark energy emitting no visible radiation
• C) antimatter, which generates a negative gravitational effect and emits radiation only if it meets matter and is annihilated
• D) neutrinos, which have very little rest mass and are very difficult to detect, but are very abundant

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