What Appears to Be the Central Energy-Generating System or "Engine

question 58

Multiple Choice

What appears to be the central energy-generating system or "engine" that is producing prodigious amounts of energy in the centers of galaxies, active galaxies, and quasars?

• A) steady series of supernova explosions, the late evolutionary stages of massive stars
• B) rapidly rotating core of matter, where friction between it and the surrounding matter causes tremendous heat and energy output
• C) supermassive black hole, where matter is compressed on falling into the hole and heated to extremely high temperatures
• D) There is no central "engine" in these sources. Their high gravity has focused radiation from many sources beyond them by gravitational lensing and they thus appear to be very bright.

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