How Can Astronomers Tell That Some Stars Are Relatively Close

question 133

Multiple Choice

How can astronomers tell that some stars are relatively close to Earth?

• 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 Earth.
• 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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Definitions:

Equivalent Units

A concept in cost accounting used to allocate costs to partially completed goods, converting them into the amount of finished goods units that could have been produced with those costs.

Direct Materials

Materials in their unprocessed state that can be directly linked to the production of a particular item.

Equivalent Unit

A concept in cost accounting that converts the amount of work done on incomplete units of production to an equivalent number of fully completed units.

Conversion Costs

Costs incurred during the manufacturing process to convert raw materials into finished goods, composed of direct labor and manufacturing overhead.