Barthélémy Pedotti
- At the center of extremes

Where are we?

The right size is when both feet are in contact with the ground - Coluche

do not expect that a scientist gives an "expert opinion" when his vision of certainty might take several centuries to achieve


From the top of my 15.5 billion hydrogen atoms (do not count! That does not even make 1,65m/5,41ft) I now assert to talk about the notion of scale

On the galactic cluster scale gravity prevails, stuff like black holes may exist and space and time are an indivisible whole
(once and for all we do not perceive time, we merely see changes in successive states)
- from that perception the concept of impermanence should have arose FIRST,
then, for convenience only, the concept of time; but hey, they did not ask for my opinion


A map of our universe by Planck

at the quantum scale, lots of contra-intuitive events occur (with impunity!) between particles whose part of the characteristics
remains unknown at a given time
- the place of the so-called strong and weak forces


Classical representation of the atom; false ... or let's say a possible aspect of the spatial function from the wave function

and approximately in the middle (known universe is about 10^(28)m wide, quantum particle is about 10^-35)m wide) we find
the life scale -the life we know- where "classic" thermodynamic forces prevail ..


scales of the universe


it is unrealistic to "penetrate" the quantum world like a tiny observer,
similarly it is an illusory dream to walk in the physical cosmos as nosy tourists;
it is much more than extremely large distances, it is a change of scale; our planet is our lonely spaceship, for a long time still...

système solaire

The trajectories of the solar system planets, to scale - the gray area is the asteroid belt; planets and even the sun are only a fraction of a pixel; Earth is on the third path from the central point.

système solaire

Comparative size of a few solar system bodies, to scale

And this impossibility is not just about speed (which is relative, therefore subject to a system of reference)
let's play the game: size of the known universe (visible part 1/) = 93 billion light-year,
theoretical (!) maximum speed of our ship = speed of light,
time to go from one "edge" to the other = 93 billion years... QED
Much smaller, crossing our galaxy: only 100,000 years...
What were you doing 100,000 years ago?
More realistic for the distance (and for the speed!): Proxima Centauri 4 light years away, average speed of 1000 000m/s:
a travel of 1200 years.
And the speed is only one side of the problem. When starting at rest (with respect to its repository) you needed a huge acceleration
to reach such a speed;
the kind of acceleration that crushes everything...

groupe local

Our local galactic cluster (planar projection);
the "local" in question is about 10 million light years wide


A galaxy which looks like our: MC51

Still, we take note that life (from small virus - 2*10^(-7)m - to giant sequoias - 10(2)m) is about in the middle,
the extremes being the quantum particle and the universe, and one might almost think that this "middle" is very similar to the place
where an observer is considering a vast landscape, obviously extended on one side as much as on the other, and probably beyond...

We can eyewitness that space and time are closely intertwined.
Let's contemplate the neighborhood: Sirius, Ross, the Swan, this is light emitted about ten years ago,
50 years ago for the polar star, Rigel 773 years...
That being the suburbs, we rise above one million years for the neighboring nebulae (i.e.the local galactic cluster)

1/ of course it is impossible to establish this size accurately - see -Wikipedia/Universe- to understand the extent of the issue.

Some illustrations used here are part of our meta-culture - ie they come from the internet
- their authors are cited as soon as they let me know - thanks to them!

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