Why isn't the Andromeda galaxy's center a strong source of energy?
A) It only appears not to be because most of the energy is released towards a direction away from our Milky Way.
B) It really is; dark matter in the space between the Andromeda Galaxy and the Milky Way is blocking our measurement of the total energy.
C) Only a relative trickle of gas falls into the black hole.
D) It is a very old black hole that has already converted most of its internal mass to energy.
E) Andromeda is a small elliptical galaxy that supplies very little free gas to the zone near the black hole.
Ans: C) Only a relative trickle of gas falls into the black hole.
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Fill in the blank(s) with the appropriate word(s).