Mars Appears to Reverse Direction and Drift Westward Across the Sky

question 58

Multiple Choice

Mars appears to reverse direction and drift westward across the sky at times because ____.

• A) Mars does not orbit the Sun at a constant velocity
• B) Earth orbits the Sun more quickly than does Mars
• C) Earth's orbit crosses Mars' orbit
• D) Mars is on the opposite side of the Sun from the Earth at times

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Definitions:

Price

The amount of money required to purchase a good or service.

Comparative Advantage

The ability of an individual, firm, or country to produce a good or service at a lower opportunity cost than other producers.

Absolute Advantage

Refers to the capability of an entity to produce a good or service more efficiently than its competitors using the same amount of resources.

Opportunity Cost

The cost of missing out on the next best alternative when making a decision.