What Method Is Used by Astronomers to Infer the Existence

question 121

Multiple Choice

What method is used by astronomers to infer the existence in space of a dark object with a mass of about 5 solar masses such as a black hole?

• A) The measurement of the effect of its gravitational force on a companion object in a binary system
• B) The measurement of the gravitational redshift of spectral lines in the spectrum of the object
• C) The estimation of the luminosity of the object and the application of the mass-luminosity relationship
• D) The photography or imaging of a region from which no light or radiation at all appears to come

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