Aliens will be bear-sized: scientist-Q:- can it be microcopic sized?-{many aliens already with us}
Aliens will be bear-sized: scientist
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University of Barcelona|cosmologist|aliens
Aliens will weigh about 300 kilogrammes - roughly of the size of a bear, according to a cosmologist.
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LONDON: Aliens, if they exist, will weigh about 300 kilogrammes - roughly of the size of a bear, according to a cosmologist.
The analysis by Fergus Simpson, from the University of Barcelona, also found that a habitable extraterrestrial planet would hold about 50 million aliens.
Simpson's findings are based on a model called Bayes' theorem and a branch of mathematics called Bayesian statistics.
The purpose of such techniques is to estimate the probabilities that change depending on the information available.
Simpson started his calculation with the number of individuals who would most likely live in a given alien civilisation, and came up with about 50 million or fewer individuals, 'Live Science' reported.
Simpson's analysis, on the prepublished site arXiv, also focused on the size of other life forms.
He noted that animals on Earth have a widely known relation between size and the number of individuals - the smaller the species is, the more individuals of that species tend to exist.
For example, an alien seeking life on Earth would be far likelier to run into a mosquito than a blue whale.
However, the relation between size and population can also be plotted on a curve against probability, which predicts that the median weight of an alien would be about 314 kg - about the size of a bear or an elk.
Based on the results of this model, about half of extraterrestrial creatures would weigh more than that and half would weigh less, Simpson said.
However, some scientists say this mathematical prediction has some serious limitations.
Michael Kopp, a professor at Aix-Marseille University in France, said he is not sure about the statistical argument because it is not clear if humans are a random sample of intelligent beings.
The analysis by Fergus Simpson, from the University of Barcelona, also found that a habitable extraterrestrial planet would hold about 50 million aliens.
Simpson's findings are based on a model called Bayes' theorem and a branch of mathematics called Bayesian statistics.
The purpose of such techniques is to estimate the probabilities that change depending on the information available.
Simpson started his calculation with the number of individuals who would most likely live in a given alien civilisation, and came up with about 50 million or fewer individuals, 'Live Science' reported.
Simpson's analysis, on the prepublished site arXiv, also focused on the size of other life forms.
He noted that animals on Earth have a widely known relation between size and the number of individuals - the smaller the species is, the more individuals of that species tend to exist.
For example, an alien seeking life on Earth would be far likelier to run into a mosquito than a blue whale.
However, the relation between size and population can also be plotted on a curve against probability, which predicts that the median weight of an alien would be about 314 kg - about the size of a bear or an elk.
Based on the results of this model, about half of extraterrestrial creatures would weigh more than that and half would weigh less, Simpson said.
However, some scientists say this mathematical prediction has some serious limitations.
Michael Kopp, a professor at Aix-Marseille University in France, said he is not sure about the statistical argument because it is not clear if humans are a random sample of intelligent beings.
some aliens already with us
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some aliens in human form killing other humans:-
These revolutionary bladeless wind turbines shake to generate electricity
Vortex
is working on its "Mini," a 41-foot model that should be ready for
commercialization in 2016, while a larger, industrial model is in the
works for 2018.
RELATED
WASHINGTON: These bladeless wind turbines can revolutionize the way wind energy is produced.
A startup out of Spain called Vortex Bladeless, whose turbines look like stalks of asparagus poking out of the ground, is using pillars that shake back and forth from the vortices created by the movement of air around the structure to generate power, the Verge reported.
Typically, a structure can only be optimized to oscillate at the specific frequencies caused by a certain wind speed, but Vortex says it is using magnets to adjust the turbine on the fly to get the most from whatever the wind speeds happen to be.
Once the structure starts vibrating, an alternator in the base of the device then converts the mechanical movement into electricity.
Vortex claims that energy produced by its turbines will cost around 40 percent less than energy made from today's wind turbines and a large part of that cost reduction comes from maintenance as the Vortex doesn't have moving parts or gears, it should last longer and won't require periodic lubrication.
The simpler design also means that manufacturing costs are about half that of a traditional wind turbine (those massive blades are expensive).
As per Vortex, its bladeless design captures around 30 percent less energy than a regular turbine, but it's possible to fit more of the "silent" Vortex models in the same area.
Vortex is working on its "Mini," a 41-foot model that should be ready for commercialization in 2016, while a larger, industrial model is in the works for 2018.
A startup out of Spain called Vortex Bladeless, whose turbines look like stalks of asparagus poking out of the ground, is using pillars that shake back and forth from the vortices created by the movement of air around the structure to generate power, the Verge reported.
Typically, a structure can only be optimized to oscillate at the specific frequencies caused by a certain wind speed, but Vortex says it is using magnets to adjust the turbine on the fly to get the most from whatever the wind speeds happen to be.
Once the structure starts vibrating, an alternator in the base of the device then converts the mechanical movement into electricity.
Vortex claims that energy produced by its turbines will cost around 40 percent less than energy made from today's wind turbines and a large part of that cost reduction comes from maintenance as the Vortex doesn't have moving parts or gears, it should last longer and won't require periodic lubrication.
The simpler design also means that manufacturing costs are about half that of a traditional wind turbine (those massive blades are expensive).
As per Vortex, its bladeless design captures around 30 percent less energy than a regular turbine, but it's possible to fit more of the "silent" Vortex models in the same area.
Vortex is working on its "Mini," a 41-foot model that should be ready for commercialization in 2016, while a larger, industrial model is in the works for 2018.
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