Are we alone in the Universe?

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lilian07
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Re: Are we alone in the Universe?




by lilian07 » 27/08/17, 20:27

To my knowledge the constants of the universe are fixed forever, from one end to the other of this same universe as the gravitational constant or the Planck constant. The very ones that make the universe coherent and whose forces are omnipresent and regulated from the start of the bigbang without ever varying in time.
The weak nuclear force which we control well (nuclear fission) the electromagnetic force (electric and magnetic force) which is known and controlled for around 100 years and the strong nuclear force which we try to control (fusion).
There remains the gravitational force which is very weak but whose constant G makes it possible to explain many things inaccessible at the other end of the universe.
So yes for this postulate of Fermi all technological species goes through the knowledge of its forces and the exploitation of communication by the electromagnetic force which allows to betray its presence.
The problem is the proportion of biological life that emerges from primitive life and there we go from an infinite probability to a zero probability depending on the conditions taken into account that lead to intelligence (either we are in the strong anthropic or we are in the mediocre).
We only know today that life emerges from extreme conditions and therefore the universe seems very prolific on terrestrial planets but nothing detected above this stage of life hence this very disturbing paradox.
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Ahmed
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Re: Are we alone in the Universe?




by Ahmed » 27/08/17, 22:55

I realize that my message was too laconic, which misled you; I wanted to say: "This is a very excessive wording for "mastery", at least for the only known technological life form ...
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chatelot16
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Re: Are we alone in the Universe?




by chatelot16 » 31/08/17, 21:39

how long has the earth been living? long time

How long has man had the means of communicating by long distance by radio ... not even a century ... and how long will it last? not necessarily long if our civilization collapses as happened to others

so it is not only the distance between the planets that makes it difficult to communicate with other forms of life ... there is also time! we will never see in space the civilizations which existed before us or which will exist after us
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lilian07
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Re: Are we alone in the Universe?




by lilian07 » 02/09/17, 15:28

and how long will it last? not necessarily long if our civilization collapses as happened to others


This is indeed an explanation for the Fermi paradox close to the principle (mediocrity) which consists in saying that a technical civilization emerges naturally but that shortly (relative to the duration of the earth) after a long biological evolution but it also implies that this same civilization certainly disappears very quickly.
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chatelot16
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Re: Are we alone in the Universe?




by chatelot16 » 01/12/17, 12:57

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Christophe
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Re: Are we alone in the Universe?




by Christophe » 01/12/17, 13:53

chatelot16 wrote:https://www.econologie.com/forums/bistrot/humour-t1191-12010.html#p329695


Uh ... link error right?

This morning I saw a documentary "interesting"(between interesting and funny): media / stanley-kubrik-is-alle-on-the-moon-t14384-10.html # p329715

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chatelot16
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Re: Are we alone in the Universe?




by chatelot16 » 01/12/17, 21:26

no it's not a mistake: humor is stronger than science

when i saw this bistro / humor-t1191-12010.html # p329695 on the subject humor I found that it deserved to be put on a suitable subject
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Christophe
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Re: Are we alone in the Universe?




by Christophe » 05/01/19, 17:26

Fermi's paradox in a nice little video:

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Re: Are we alone in the Universe?




by Christophe » 05/01/19, 18:59

https://www.levif.be/actualite/belgique ... 74259.html

Belgians reported 255 UFOs in 2018

The Belgians reported 179 unidentified flying objects to the Belgische UFO-meldpunt and 76 to its French-speaking counterpart, the Belgian Committee for the Study of Spatial Phenomena (Cobeps) in 2018, according to an initial annual report drawn up.

With 255 notifications in total, the number of UFO reports increased in both the northern and southern parts of the country. The Belgische UFO-meldpunt had thus identified 134 observations in 2017, 33% less than last year.

The summer months are best for reporting. July and August 2018 are no exception to the rule with 44 observations during this period. Most cases are explained by heat.

Reports also peaked in October, mainly due to particularly clear weather.


http://www.cobeps.org/
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Re: Are we alone in the Universe?




by Christophe » 05/01/19, 19:16

If some have an explanation for the following observation, now that I think about it I had never talked about it here.

Made in late July 2017 a little before midnight. (I could find the exact date)

a) I watched the sky with my son as I often do
b) We saw what I thought to be a satellite: luminosity of a star with a straight path at constant speed
c) Trajectory almost full south (already not very common but read more)
d) Location: 25 km north of Sedan
e) The object stopped and became a "fixed star" impossible to distinguish it from others
f) The deceleration was done, at arm's length, over a distance of about 3-4 cm in 2 or 3 seconds ...

The most credible explanation (the only one in fact) that I found is the installation of a geostationary satellite but the physical numbers do not stick!

Indeed, at 36000 km instead of 400 km gives a very important speed of the order of 2 km / h or 430 km / s since at 000 km the satellites are at around 675 km / h. (estimate made with a simple triangle and Thales ...)

And above all an even greater slowdown: if we assume that it was done over 3 seconds, this implies a slowdown of (675-3) / 3 = 224 km / s² or 23 G! : Mrgreen: 3 km / s is the speed of geostationary satellites

In short, impossible! The truth is elsewhere!

In short if someone has another hypothesis?
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