The Mass of Visible Matter in a Galaxy Can Be

question 40

Multiple Choice

The mass of visible matter in a galaxy can be estimated by measuring its luminosity. When this is compared with the measured mass of the galaxy, astronomers find that ____.

• A) the measured mass is about ten times the estimated mass, due to the effects of the central black hole
• B) the measured mass is approximately equal to the estimated mass
• C) there is no clear relationship between the estimated and measured mass
• D) the measured mass is about ten times the estimated mass, due to the effects of dark matter
• E) the estimated mass is about ten times the measured mass, due to the effects of dark matter

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Definitions:

Prime Factors

Prime factors of a number are the prime numbers that divide the given number exactly, without leaving a remainder.

Product

The result obtained by multiplying two or more quantities together.

Greatest Common Factor

The largest integer that divides two or more integers without a remainder.

Expressions

Mathematical phrases that can contain numbers, variables, and operation symbols but do not include an equality sign.