What if galaxies were colliding today?
So the Milky Way and Andromeda
what impact would this have on us?
(5 votes)
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It would not have any effect on us at all, in principle it would not be noticed. The only thing you would notice would be that much more stars would be seen in the sky, and the night sky would almost shine in places (similar to polar lights), because in the collision huge gas masses virtually meet each other, which compress themselves, the formation of stars being stimulated. Otherwise, however, it would not have a negative effect on the Earth or our solar system, because star collisions would not exist when the galaxies are fused, and the space between the stars is too large. The whole collapse process is a very long process. Until the new galaxy has formed and stabilized it takes at least 2 billion years.
If we were to become at least hundreds of millions to billions of years old, this would certainly be breathtakingly spectacular. Many new stars would arise, through the shock waves of the interstellar gases. And of course, the shape would change completely.
As many others have written here, the danger of a collision is very low due to the only low average density of a galaxy. The middle star distance is about 0.5 light years in the center and about approx. 4 Lj, which continues outside, of course, is growing.
What happens in the centers with the significantly higher density is another question.
https://www.weltderphysik.de/area/universum/galaxien-und-galaxienhaufen/kosmische-kollisionen/
https://abenteuer-universum.de/galaxien/milch.html
The probability of collisions between the celestial bodies is extremely low – this has already been done.
But something else would happen. Because the interstellar clouds would also collide. As a result, shock waves run through these clouds. This means nothing other than a local compaction. The more dense a cloud region, the more it contributes to collapse. In this way, Supernovae can also collapse in near interstellar clouds and thus initiate star formation.
This happens when the galaxies penetrate everywhere “simultaneously” (it takes naturally in human periods thought to penetrate extremely long from the first contact to the complete one. We know this from other galaxies, the so-called starburst galaxies.
But why StarBURST? There would have to be a massive increase in birth in such a collision. It does. But just the biggest stars explode very quickly (after a few million years) in Supernovae. Therefore, there are extremely many supernovae or even young stars. What a fireworks. And honestly: The name Starburstgalaxy is just cool, right?
Such a process lasts a few million years. Therefore, one would not experience any changes in the life span of a person, that would then be normal. This normally would mean much more frequent supernovae, a much richer starry sky than our, much more and partly also brighter stars.
We have such a starburst galaxy even in our local group with IC 10. However, the emergence is so fresh that it has not yet come to the massive supernova explosions – that is why future starburst galaxy would be more correct. Even if the massive star formation rate is already present.
None; the galaxies consist mainly of one: damn much empty space! So before anything that comes from the direction of Andromeda could become dangerous to us here in the solar system, the sun has probably reached its Roter-Riese stage. Thus, the Earth is likely to be uninhabitable for a long time – even if one assumes that the collision of the main masses of the two galaxies begins at this moment (which is not the case anyway).
You can’t imagine it as a sudden event like an impact or a bang. It is a cosmological process that will probably go over millions of years. It will take place in imperceptible and countless transitions until the two galaxies merge into a new galaxy.
The spaces between the stars are still so large that collisions are extremely rare to excluded. Rather, there are serious influences that will play a role here.
Galaxies are not solid objects. Between the stars within the galaxies is incredibly much space, so the galaxies collide with each other without probably even two stars colliding with each other.
The “coupling” of the galaxies would throw a few stars out of the orbit in the galaxy, but this would eventually normalize.
But this process will last many thousand years, if not even millions of years.
So this isn’t like two stars explode in a supernova?
we will not remember
Even if two stars would collide, that is to say they would penetrate each other seriously and create a larger star, it does not mean that this is a Nova or Supernova. It depends on the masses, so on the original star types their structure. And in the way of collision: slow approach with ever closer interconnection, high speed with streaking passing, full collision and so on.
There is even one wikiped/ia entry
We would probably not notice anything about it. Think about it. Up to the next star there are 4 light years, in between there is nothing, only empty space. And that’s what it looks like between all the stars in the galaxies.
Basically, there is mostly nothing in conflict with nothing.
Look at this simulation: https://youtu.be/4disyKG7XtU?si=ZX4m3TiattOy1ORq (Attention: the period is specified in English trillion, i.e. billions in German)
None.
The distances between the stars belonging to a galaxy are so large that two galaxies (milk roads) can penetrate without there being a relevant number of star collisions.
But in clear nights the picture of the Milky Way on the night sky would be somewhat different.
You can’t believe it. But because of the great distances between the stars, there will be no collisions between the stars according to computer simulations.
Whether there are still people on earth is a completely different question.
do you mean today or does it until November, that I am in M51 – NGC 5195, they’ve got this behind me, I’ll see
None. The starry sky changes, but so slowly that no change is visible during a human life span.
By the way, the “collection” of the two galaxies is basically just that the stars of the Milky Way are driving around somewhere in the distances between the stars of the Andromeda galaxy and the stars of the Andromeda galaxy somewhere in the distances between the stars of the Milky Way. There’s nothing. Come on.
Probably not because they do not collide but would penetrate due to the great distances between the stars.
We’d be wiped out. But the purpose of God is different: eternal life on a paradisiacal for all who believe in his promises.
The question was not what a fictitious gott from a dusty book says
Very unlikely. It’s more likely that nothing will happen.