Is the universe filled with intelligent life? Possibly not.

Started by René, September 07, 2019, 09:07:27 am

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Tangled-Universe

PBS Space Time is a great channel which answers many many questions and ideas discussed here:

https://www.youtube.com/channel/UC7_gcs09iThXybpVgjHZ_7g

René

Quote from: Matt on September 10, 2019, 02:40:38 pmYou can't push past c, so there is no possibility of reversing time. To travel at the speed of c in an external reference frame, you travel at infinite speed in the moving frame. No matter how much faster you try to go beyond infinity, you are still travelling at the speed of infinity. To the external viewer this appear to be c. So it's impossible to go faster than this.
Makes sense. No matter how much you add to infinity, it remains infinite.

René

Quote from: Tangled-Universe on September 11, 2019, 06:40:52 amPBS Space Time is a great channel which answers many many questions and ideas discussed here:

https://www.youtube.com/channel/UC7_gcs09iThXybpVgjHZ_7g
Thank you for this. Images and animations help me enormously in understanding abstract matters.

René

The discussion about the existence or non-existence of extraterrestrial life will remain hypothetical until we discover it. In his book Extraterrestrial Civilizations, Isaac Asimov(author) provides the (theoretical) proof that there are many intelligent aliens in the universe. He does this by comparing two magnitudes, namely the number of estimated planets in the universe, and the long series of coincidences that have led to the birth of our planet and the life on it.
It is remarkable that Simon Conway Morris(evolutionary biologist) uses the same evidence and reasoning in his book Life's Solution to show that there may be life outside the earth, but that this probably has not evolved beyond than microbes.

Tangled-Universe

Another complication is the expansion rate of the universe, which is the same for every position within the universe.
At the moment the expansion rate is estimated at about 73km/s/Mpc, where Mpc stands for megaparsec, a unit of distance. (There's heavy debate on this value though, some say it should be lower, like 68)
So the further away an object is, the faster it's receding from us.
Consequently, any object or point in the universe beyond the Hubble radius, approx 14.7B lightyears, has recession speeds faster than the speed of light.

These parts of outside of our observable universe are inaccessible to us, physically but also sensory.
We have no clear idea how large the universe is, we only know limits of our observable universe (constrained to the Hubble radius), but if there's intelligent life out there then some or perhaps all of it may be impossible to reach for us or impossible for them to reach us.

N-drju

Quote from: Tangled-Universe on September 12, 2019, 08:12:09 amWe have no clear idea how large the universe is, we only know limits of our observable universe (constrained to the Hubble radius), but if there's intelligent life out there then some or perhaps all of it may be impossible to reach for us or impossible for them to reach us.

Unless wormholes are proved to exist. Until lately mankind had no idea that bosons exist. Who knows what else could be discovered?

The problem with wormholes might as well lie in the fact that they may be too small or too short-lived for us to even notice and make us of. But it doesn't change the fact that they have a potential to be space tunnels...
"This year - a factory of semiconductors. Next year - a factory of whole conductors!"

Ariel DK

Quote from: N-drju on September 12, 2019, 01:55:50 pm
Quote from: Tangled-Universe on September 12, 2019, 08:12:09 amWe have no clear idea how large the universe is, we only know limits of our observable universe (constrained to the Hubble radius), but if there's intelligent life out there then some or perhaps all of it may be impossible to reach for us or impossible for them to reach us.

Unless wormholes are proved to exist. Until lately mankind had no idea that bosons exist. Who knows what else could be discovered?

The problem with wormholes might as well lie in the fact that they may be too small or too short-lived for us to even notice and make us of. But it doesn't change the fact that they have a potential to be space tunnels...

Indeed, we still aren't proved that even the black holes exist mathematically talking...

The existence of this objects in fact, are proof that the space-time can be both compressed near to infinit, but "no more". this is what a singularity actually is: in just a million of million of microseconds, a singularity colapse into itself and left to exist, but she also warp the time while doing this, so, for an exterior observer timing the event, it would seems to take trillions of years. the curious thing about this is the fact that by definition, a black hole is a collapsed zone of the space-time, but the singularity is not really collapsed, but still "collapsing". so, is a black hole a real object, or just an illusion resulting of warped time?

In my opinion, due that we don't even understand the nature of our universe, if a intelligent alien civilisation evolved millions of year before us, trespassing this natural frontiers, we simply could not differentiate their actions from the nature. the less debated and elegant solution to the Fermi paradox.
Hmmm, what version of Terragen use god?

René






True! It is even conceivable that all those centuries of studying the universe we have actually studied the oeuvre of aliens.

Ariel DK

Quote from: René on October 10, 2019, 01:35:40 amTrue! It is even conceivable that all those centuries of studying the universe we have actually studied the oeuvre of aliens.

Or even the whole universe can be their "oeuvre"...  ;)
Hmmm, what version of Terragen use god?