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An Astronomer Discovers That All Galaxies with a Particular Characteristic

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Essay

An astronomer discovers that all galaxies with a particular characteristic have a radius precisely equal to 10 kpc.He or she measures the angular sizes of a large set of these galaxies.How can he or she use his or her measurements to deduce the overall density of the Universe?


Definitions:

Book Value

The value of a company or asset according to its financial statements, calculated by taking the total assets minus the liabilities and intangible assets.

Mortgage Payable

A liability account on the balance sheet representing the amount owed to a lender for property purchased.

Market Value

The present-day trading price for assets or services available in the open market.

Book Value

The net value of a company's assets as found on its balance sheet, which is often different from its market value.

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