Based on the Chemical Abundances and Velocities of Stars in the Milky

question 92

Multiple Choice

Based on the chemical abundances and velocities of stars in the Milky Way's disk and halo, we can conclude that the protogalactic fragments that came together to form the galaxy merged when the fragments had:

• A) not yet formed stars
• B) converted most of their gas into stars
• C) begun forming stars
• D) each formed a supermassive black hole at their center
• E) gathered a lot of dark matter from surrounding space

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Definitions:

Occurrence

Occurrence refers to the act or fact of happening or existing in a particular time or place.

Variables

Elements or features that can assume different values in a dataset or experiment.

Assumptions

Premises or conditions accepted as true without proof, used as a foundation for reasoning or calculations.

NPV

Net Present Value, a financial metric used to evaluate the profitability of an investment or project by calculating the difference between the present value of cash inflows and outflows.