Why Does the Cepheid Distance Method Fail Us Beyond About

question 115

Multiple Choice

Why does the Cepheid distance method fail us beyond about 20 Mpc?

• A) The intergalactic dust reddens the Cepheid's light and apparent brightness.
• B) Distant galaxies are seen in the past, and Cepheids evolve with time.
• C) The periods of Cepheids grows longer as the distances increase.
• D) Distant galaxies are younger than our Milky Way; too young to have Cepheids yet.
• E) Even with the HST, the most luminous Cepheids are too faint to be seen beyond 20 Mpc.

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