Apr 5, 2016 08:38 PM
(This post was last modified: Apr 5, 2016 08:42 PM by C C.)
Can a Living Creature Be as Big as a Galaxy?
http://nautil.us/issue/34/adaptation/can...s-a-galaxy
EXCERPT: . . . What about on the supersize end of the spectrum? William S. Burroughs, in his novel The Ticket That Exploded, imagined that beneath a planetary surface, lies “a vast mineral consciousness near absolute zero thinking in slow formations of crystal.” The astronomer Fred Hoyle wrote dramatically and convincingly of a sentient hyper-intelligent “Black Cloud,” comparable to Earth-sun distance. His idea presaged the concept of Dyson spheres, massive structures that completely surround a star and capture most of its energy. It is also supported by calculations that my colleague Fred Adams and I are performing, that indicate that the most effective information-processing structures in the current-day galaxy might be catalyzed within the sooty winds ejected by dying red giant stars. For a few tens of thousands of years, dust-shrouded red giants provide enough energy, a large enough entropy gradient, and enough raw material to potentially out-compute the biospheres of a billion Earth-like planets.
How big could life forms like these become? Interesting thoughts require not only a complex brain, but also sufficient time for formulation. [...] If our brains grew enormously to say, the size of our solar system, and featured speed-of-light signaling, the same number of message crossings would require more than the entire current age of the universe, leaving no time for evolution to work its course. If a brain were as big as our galaxy, the problem would become even more severe. From the moment of its formation, there has been time for only 10,000 or so messages to travel from one side of our galaxy to the other. We can argue, then, that, it is difficult to imagine any life-like entities with complexity rivaling the human brain that occupy scales larger than the stellar size scale. Were they to exist, they wouldn’t yet have had sufficient time to actually do anything....
This Astrobiologist Is Collecting Unrecognizable Beings from the Stratosphere
http://nautil.us/blog/this-astrobiologis...ratosphere
EXCERPT: Milton Wainwright believes he’s seen ET. In Earth’s upper atmosphere, he claims to have found evidence for panspermia—the hypothesis that life travels through the cosmos via meteoroids and other objects. A microbiologist and astrophysicist at the University of Sheffield, Wainwright sends large balloons up to the stratosphere, as high as 25 miles above the planet’s surface, to look for microorganisms drifting in from space. “Nearly every time we go to the stratosphere, we find these unusual organisms,” he says. “They’re not coming up from Earth....”
http://nautil.us/issue/34/adaptation/can...s-a-galaxy
EXCERPT: . . . What about on the supersize end of the spectrum? William S. Burroughs, in his novel The Ticket That Exploded, imagined that beneath a planetary surface, lies “a vast mineral consciousness near absolute zero thinking in slow formations of crystal.” The astronomer Fred Hoyle wrote dramatically and convincingly of a sentient hyper-intelligent “Black Cloud,” comparable to Earth-sun distance. His idea presaged the concept of Dyson spheres, massive structures that completely surround a star and capture most of its energy. It is also supported by calculations that my colleague Fred Adams and I are performing, that indicate that the most effective information-processing structures in the current-day galaxy might be catalyzed within the sooty winds ejected by dying red giant stars. For a few tens of thousands of years, dust-shrouded red giants provide enough energy, a large enough entropy gradient, and enough raw material to potentially out-compute the biospheres of a billion Earth-like planets.
How big could life forms like these become? Interesting thoughts require not only a complex brain, but also sufficient time for formulation. [...] If our brains grew enormously to say, the size of our solar system, and featured speed-of-light signaling, the same number of message crossings would require more than the entire current age of the universe, leaving no time for evolution to work its course. If a brain were as big as our galaxy, the problem would become even more severe. From the moment of its formation, there has been time for only 10,000 or so messages to travel from one side of our galaxy to the other. We can argue, then, that, it is difficult to imagine any life-like entities with complexity rivaling the human brain that occupy scales larger than the stellar size scale. Were they to exist, they wouldn’t yet have had sufficient time to actually do anything....
This Astrobiologist Is Collecting Unrecognizable Beings from the Stratosphere
http://nautil.us/blog/this-astrobiologis...ratosphere
EXCERPT: Milton Wainwright believes he’s seen ET. In Earth’s upper atmosphere, he claims to have found evidence for panspermia—the hypothesis that life travels through the cosmos via meteoroids and other objects. A microbiologist and astrophysicist at the University of Sheffield, Wainwright sends large balloons up to the stratosphere, as high as 25 miles above the planet’s surface, to look for microorganisms drifting in from space. “Nearly every time we go to the stratosphere, we find these unusual organisms,” he says. “They’re not coming up from Earth....”