Philip Ball writes for the Observer about the ever-popular question of extraterrestrial life, which is not an LH concern (for what it’s worth, my take is that I would be astonished if there were none, but surprised if we find any in the foreseeable future, and by “find” I mean find actual living beings, not “signs pointing unmistakably”). What is LH material is this odd linguistic suggestion:
[Stuart] Bartlett, working with astrobiologist Michael Wong of the University of Washington in Seattle, argues that we need to escape the straitjacket of Earth-based thinking about life. They propose introducing a broader category called “lyfe” (pronounced, in an oddly West Country fashion, as “loif”), of which life as we know it is just one variation. “Our proposal attempts to break free of some of the potential prejudices due to us being part of this one instantiation of lyfe,” says Bartlett.
They suggest four criteria for lyfe:
1. It draws on energy sources in its environment that keep it from becoming uniform and unchanging.
2. It grows exponentially (for example by replication).
3. It can regulate itself to stay stable in a changing environment.
4. It learns and remembers information about that environment. Darwinian evolution is an example of such learning over very long timescales: genes preserve useful adaptations to particular circumstances.
The two researchers say there are “sublyfe” systems that only meet some of these criteria, and also perhaps “superlyfe” that meets additional ones: lyfe forms that have capabilities beyond ours and that might look on us as we do on complex but non-living processes such as crystal growth.
“Our hope is that this definition frees our imaginations enough to not miss lyfe that might be hiding in plain sight,” says Bartlett. He and Wong suggest that some lyving organisms might use energy sources untapped here on Earth, such as magnetic fields or kinetic energy, the energy of motion. “There is no known life form that directly harnesses kinetic energy into its metabolism,” says Bartlett.
I rarely try to predict the future, but I will make a prediction about this: it will not catch on. (Thanks, Trevor!)
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