How Can We Tell That Some Stars Are Relatively Close

question 222

Multiple Choice

How can we tell that some stars are relatively close to Earth in the sky?

• A) The stars appear to move periodically back and forth against the background stars because of Earth's movement around the Sun.
• B) The stars appear to be extremely bright and must therefore be very close to us.
• C) The stars are occasionally occulted or eclipsed by the Moon; hence, they must be close.
• D) The light from these stars shows only a very small redshift caused by the universal expansion of the universe, so they must be close.

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Total Revenue

The sum of all earnings a company acquires from selling goods or offering services over a specific timeframe.

Total Cost

The sum of fixed costs and variable costs incurred by a firm in the production of a good or service.

Break-even Price

The price level at which total revenues are equal to total costs, resulting in neither profit nor loss.

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The decrease in economic value arising from factors such as poor decisions, market shifts, or external disruptions affecting profitability.