Why Do Astronomers Often Measure the Visible-Light Apparent Brightness Instead

question 44

Multiple Choice

Why do astronomers often measure the visible-light apparent brightness instead of the total apparent brightness of a star?

• A)All stars put out most of their light in the visible range of the spectrum.
• B)In order to measure the total apparent brightness of a star,you must measure its brightness in all wavelengths,and this is difficult to do.The only wavelengths you can measure from the surface of Earth are visible and radio wavelengths.
• C)Most stars do not put out light in other ranges of the spectrum.
• D)They are identical for most stars.
• E)Astronomers are lazy.

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