Like Jupiter and Saturn, Neptune emits about 2.5 times as much heat energy as it receives from the Sun, although calculations show it should have already lost all of its original heat. What is the most likely explanation?
A. Radioactive decay has kicked into overdrive, with runaway reactions taking place.
B. There are also unexplained gravitational effects taking place, which may hold some clue as to where the heat may be coming from.
C. Uranus' gravity is creating a "slingshot" effect, catapulting solar winds into Neptune's atmosphere in the form of as of yet undetected radiation.
D. The basis for these calculations is currently being questioned by a new breed of more probing scientists.
E. Unlike Uranus, it is still contracting.
Answer: E
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