"what is the difference between an explosive adaption and a gradual adaption? also what is a mass extinction in realation to a smaller extiction?"
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Question
Do we have any idea what is pulling on the orbit of Pluto? I have heard several things, from a black hole to a star to a brown dwarf.
Pluto is being pulled gravitationally by everything in the universe, with the Sun, Jupiter, Saturn, Uranus, and Neptune dominating. There is nothing strange about its orbit, and no evidence of any massive objects orbiting the Sun beyond Pluto: no undiscovered planets, nearby stars, or brown dwarfs. I don’t know where you have heard such rumors, but probably not from any reputable science source. David Morrison
NAI Senior Scientist
January 31, 2008
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- Astrobiology Career Path Suggestions
