"Will pluto and neptune ever collide since thier orbits seems to cross, if so when? and if so what would that collision be like? "
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Ask an Astrobiologist has received more than 2500 questions about Nibiru and 2012, with more than 200 answers posted. Please read a summary of the answers that have already been posted, view a video on these topics, use the search feature and read the FAQ’s before submitting questions on these topics.
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Question
How could you tell if a cell is living or dead?
This deceptively simple question is not easy to answer. If the cell is part of a multicelled organism (like animals), the difference between living and dead is defined for the whole organism, not just a single cell. If the cell is an independent organism such as bacteria and archaea, the issue of life and death is also hard to focus on, since many of these single cells can be dehydrated and survive for hundreds of thousands of years in a state that appears dead, only to revive when conditions improve. I am sorry I can not provide a satisfactory answer. David Morrison
NAI Senior Scientist
May 22, 2006
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