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general scientific debate. Presentations of new technologies (not directly related to renewable energy or biofuels or other themes developed in other sub forums).
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izentrop
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Mapping the universe

Unread Messageby izentrop » 08/01/18, 09:17

I think that knowing where we come from and where we are going to interest everyone. In any case, the discoveries of astrophysics have always fascinated me.

It all started with the 7 Samurai, when they announced that the universe was expanding and heading towards a single point: the big attractor.
A leader of the time told them (roughly): "anything, your career is ruined" : Shock:
Thanks to the Doppler effect applied to the light, we could record the direction and the speed of each celestial object and we put all that in big computers to get out a map in 3 D 42 billion diameter: visible universe multiplied by expansion.

The very nice Hélène Courtois explains it better than me
Explorer in the geographical sense of the term, or rather cosmographic because thanks to his work, we know a little better where we are located in the Universe, at quite dizzying distances. Indeed, after the solar system, there is our galaxy, the Milky Way, included in a Local Group, itself included in a set of about 1 thousands of other galaxies, the supercluster of the Virgin, which is him - even included, since its discovery by our guest in 2014, in an even larger superamas, named Laniakea. This discovery earned him a place in the list of 50 most influential personalities of France: https://www.franceculture.fr/emissions/ ... -du-cosmos


In image, it's even better. There are even several attractors and a foil to counterbalance all that. It is a theory that is confirmed from day to day and that needs even more data to strengthen itself.
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Bardal
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Re: Mapping the universe

Unread Messageby Bardal » 08/01/18, 11:15

Sumptuous ... Absolutely sumptuous ...

And who said that science was anything but poetry?
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Re: Mapping the universe

Unread Messageby Bardal » 09/01/18, 21:32

It's weird that nobody else is interested ...
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Re: Mapping the universe

Unread Messageby izentrop » 09/01/18, 23:53

It does not have to be pretty down to earth. : Mrgreen:

We know for example that the galaxy of Andromeda is heading us at a vertiginous speed and that our two galaxies will eventually meet ... in 5 billions of years ... It's crazy no?
In fact it does not matter because the earth will already be swallowed up for a long time by the sun become giant red, but if it were not the case, the space being mostly populated with emptiness, there is very little chance of collision.

They are not even forecasts for the Nostradamus, because we understand more and more the mechanisms of the universe which is repeated everywhere in the same way.

Here is the crab nebula, which is none other than the rest of a supernova.
Image

Laurence Sacco is also a great poet, very sharp in details. https://www.futura-sciences.com/science ... eil-14762/
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Re: Mapping the universe

Unread Messageby lilian07 » 10/01/18, 18:58

How can such a galaxy strike us?
I think more of a local disturbance of the stars that compose it because when we imagine the growing gap between the planets and between solar systems we imagine that such a collision is very unlikely.
In any case it is sometimes in the universe, or the oddities it creates (black hole, bi stars, explosions ....)
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Re: Mapping the universe

Unread Messageby izentrop » 11/01/18, 00:24

Hit is not the word, but they would already have met 10 billion years ago https://www.futura-sciences.com/science ... ion-47672/ and should meet again in 5 billions of years (to the ladle).
In fact they both run at 2.4 million km / h towards the big attractor, but as they are relatively close, they attract each other by gravitational effect by making the yoyo
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Re: Mapping the universe

Unread Messageby izentrop » 18/01/18, 00:42

Continuation of the soap opera on where we come from and where we go:

Origin of the solar system, its formation of the appearance of water, life, a succession of coincidences that make us here today. More and more details and challenges, which are discovered by researchers in all scientific fields.

All told by eminent enthusiasts https://www.franceculture.fr/emissions/ ... nvier-2018
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