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In 1981, Frank Tipler[4] put forth an argument that extraterrestrial intelligences do not exist, based on the absence of von Neumann probes. Given even a moderate rate of replication and the history of the galaxy, such probes should already be common throughout space and thus, we should have already encountered them. Because we have not, this shows that extraterrestrial intelligences do not exist.
And that brings us to the question of how to spot them – according to Osmanov, this swarm of exploring probes would give off luminous emissions as they gathered up protons in their flight.
If we were looking in the right direction, we should be able to see them, he says, and assuming they were moving in formation, they might look like a comet several kilometres across in the infrared part of the spectrum.
He explains that the concept is an attempt at developing an answer to the infamous Fermi Paradox, which wonders why we have yet to find evidence for aliens despite the vastness of the Milky Way galaxy and the seemingly high probably that ETs are 'out there.'
In his paper, Osmanov suggests that perhaps scientists have been looking for the wrong signs of life and theorizes that ETs may rely on self-replicating spacecraft that are built on a nanoscale. Dubbed 'von Neumann probes,' these theoretical craft have been postulated by scientists in the past, however they have largely been dismissed as a possibility since there would not be enough resources in space for such sizeable vehicles to continually reproduce. However, Osmanov argues that incredibly small versions of the probes would be able to harness the necessary materials from hydrogen atoms orbiting space dust.
By virtue of their diminutive size, the astrophysicist says that these probes could number in the trillions yet still be too small for Earth-bound astronomers to spot. In fact, the only way in which we might be able to see these craft is if they came together in a swarm which would, in turn, resemble something similar to a comet out in space.
originally posted by: underwerks
I've been thinking about something similar recently. You could transmit lots of nanoscale probes much closer to the speed of light than one larger solid craft.
What if an advanced civilization sent out billions of nanoscale probes that could then reconfigure into a larger craft once arriving at the destination?
originally posted by: FlyingFox
My problem is with how they transmit a signal back home, thru interstellar space.
originally posted by: underwerks
I've been thinking about something similar recently. You could transmit lots of nanoscale probes much closer to the speed of light than one larger solid craft.
What if an advanced civilization sent out billions of nanoscale probes that could then reconfigure into a larger craft once arriving at the destination?
originally posted by: Ophiuchus 13
Quantum entanglement.
originally posted by: FlyingFox
My problem is with how they transmit a signal back home, thru interstellar space.