How Do We Know That There Is Much More Mass

question 17

Multiple Choice

How do we know that there is much more mass in the halo of our galaxy than in the disk?

• A)There are so many globular clusters in the halo that their total mass is greater than the mass of stars in the disk.
• B)Stars in the outskirts of the Milky Way orbit the galaxy at much higher speeds than we would expect if all the mass were concentrated in the disk.
• C)Although the question of mass in the halo was long mysterious,we now know it exists because we see so many brown dwarfs in the halo.
• D)The recent discovery of photinos,combined with theoretical predictions,tells us that there must be a huge mass of photinos in the halo.
• E)We don't know that there is more mass in the halo;it is only a guess based on theory.

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Definitions:

Output

The amount of goods or services produced by a business, industry, or economy in a given period.

Production Isoquants

Curves that represent different combinations of inputs that produce the same level of output, illustrating the trade-offs in production processes.

Production Functions

Mathematical relations stipulating how output levels are achieved with different combinations of input factors such as labor and capital.

Input

Refers to the resources used in the production of goods and services, such as labor, raw materials, and capital.