Before You Can Use Hubble's Law to Get the Distance

question 24

Multiple Choice

Before you can use Hubble's Law to get the distance to a galaxy, what observation must you make of that galaxy?

• A) you must find a Cepheid variable star in the galaxy
• B) you must take a spectrum of the galaxy and measure the red shift
• C) you must measure how strongly the galaxy emits radio waves at a wavelength of 21 centimeters
• D) you must find a Type Ia supernova that is exploding in that galaxy
• E) all you need to do is look at the galaxy through any telescope

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