What Observational Evidence Seems to Indicate the Presence of a Supermassive

question 67

Multiple Choice

What observational evidence seems to indicate the presence of a supermassive black hole at the center of the Milky Way's neighboring galaxy, M31, in Andromeda?

• A) slow but measurable motion of the Milky Way Galaxy toward M31 under the intense gravitational force of its black hole
• B) very intense X-ray emission from a very small central core, indicating a very hot source
• C) spectroscopic measurements of extremely high and symmetric Doppler shifts from stars orbiting rapidly around a massive object near the galactic center
• D) small but dark region on detailed photographs of M31, showing an area from which light cannot escape

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Definitions:

Weighted-Average Method

An inventory valuation technique that calculates the cost of inventory by taking the average cost of all similar items present in the inventory.

First-In, First-Out Method

An inventory valuation method whereby the oldest inventory items are recorded as sold first, thus the cost of items purchased first is charged against revenue earlier.

Equivalent Units

A concept used in cost accounting to convert units of production into a common measure.

First-In, First-Out Method

An inventory valuation method where the oldest inventory items are recorded as sold first, leaving the newest inventory in stock.