Cosmic Collision?

[welsh]

Bad News- Looks like the Milky Way Galaxy is going to collide with the Andromeda.

Good News- Sun will probably go supernova before that happens.

But if you want to watch what it will look like- check this out.

cosmic collision!

Thanks to PA Media for pointing this out.

 

[Bradylama]

It'd really be something to live at a time when Andromeda is visible in the night's sky.

 

[Per]

It'd really be something to live at a time when Andromeda is visible in the night's sky.

Not for that reason especially. We already have one galaxy much closer - our own - and that just shows as a fuzzy band of stars. The Andromeda galaxy, if it gets a lot closer than now, will grow from a small haze into a big haze, none of which will be very obvious or thought of as utterly special by people who might live at the time.

Also, to pick nits, the sun won't go supernova.

 

[Maphusio]

How do you figure the sun will not go nova? Once its fuel is used up it begins to collapse in on itself. As Steven's little theory has become fact in the past 20 years. However you are probably correct on not noticing much on the andromeda galaxy. However, we would be whiteness to the supernovas that would take place from solar systems colliding into each other. This has already been documented through out the galaxy.... But isn't the Andromeda galaxy red shifting from our point of view?

 

[Sina]

Only certain types of stars go into Nova or even more rare Supernova.

Our sun will just burn out and slowly turn into a Brown dwarf that will last approximately until the final entropy end of universe.

Its too small to go Nova.

For a star to go into Nova it has to be a giant star in the beginning.
sorry but i don't remember what size is the starting limit now.
When that kind of star uses up hydrogen in itself, it outer core collapses into center which in turn creates big explosion.
Nova.

Our sun will just contract a little and fade out slowly.

But if you like special effects you will see it expand into white giant for a while before it starts to lose fuel.
In that stage it will consume all inner planets and possibly Jupiter or more.


Furthermore when two galaxies collide stars in them go between each other, they do not collide. The distancess between individual stars are too great for them to collide.

Ask Hubble if you don't believe me.

 

[Member of Khans]

Furthermore when two galaxies collide stars in them go between each other, they do not collide. The distances between individual stars are too great for them to collide.

Depends on the area. If two galactic centers crash into another, the gravity of some bigger stars may be strong enough to have a noticeable effect on the movements of other larger Objects (i.e. stars), due to the minimal spaces between stars in galactic centers
Anyway, I agree on the fact that two galaxies do not simply "crash" together, but either melt together to one -if the interaction of two strong gravity fields is strong enough to absorb the kinetic energy (and Galaxies do have A LOT of kinetic energy)- or will interpenetrate each other and drift apart again while trailing a band of hydrogen (which may contain a few solar systems ).
I'm no physicist, I don't know which effect such a "collision" would have on a normal solar system or an intelligent civilisation, but they surely can't be very nice.

 

[calculon000]

I would think that if two stars collide, anything within a very, very, very, large radius will be so fucked, that you would need very good topical cream to stop the bleeding soreness from the collective ass of everything in that radius.

 

[Member of Khans]

Indeed.

 

[Sovz]

who cares, we all will be dead by then.

 

[Member of Khans]

Hm. But it's a strange thought that maybe other intelligent species and civilizations in our Galaxy will be razed.

EDIT: No, I'm not a Trekkie.

 

[Per]

How do you figure the sun will not go nova? Once its fuel is used up it begins to collapse in on itself. As Steven's little theory has become fact in the past 20 years.

Which theory would that be? Hawking's accomplished much, but not primarily in the field of stellar physics. The sun's fate has been pretty well known for half a century now.

Also, technically speaking a nova and a supernova are two very different things, although there are superficial similarities between a nova and a certain type of supernova.

However, we would be whiteness to the supernovas that would take place from solar systems colliding into each other. This has already been documented through out the galaxy....

It has? I've never heard of that.

But isn't the Andromeda galaxy red shifting from our point of view?

Actually it would be blueshifting since it's approaching, but the speeds involved are far too low for it to be significant or remotely noticeable.

Our sun will just burn out and slowly turn into a Brown dwarf that will last approximately until the final entropy end of universe.

The sun will eventually be a white dwarf - brown dwarves usually refer to Jupiter-like objects, or burned-out red dwarves. Then after many billions of years it will cool into something like a black dwarf.

But if you like special effects you will see it expand into white giant for a while before it starts to lose fuel.
In that stage it will consume all inner planets and possibly Jupiter or more.

Red giant. We can only speculate about how far out it goes, but last thing I read (science paper thingy, that is, not popular article) was that it will probably not expand to reach Earth, although at the time Earth's orbit may start to degrade due to drag so that it eventually goes into the Sun anyway. I don't think Mars is in any danger of actual engulfage.

I would think that if two stars collide, anything within a very, very, very, large radius will be so fucked, that you would need very good topical cream to stop the bleeding soreness from the collective ass of everything in that radius.

If there were any planets around those stars initially they'd be fucked, of course, but I don't think the effects of the collision itself would have to spread very far out from there. A supernova on the other hand releases energy on a whole other scale and can indeed fry nearby solar systems with radiation.

 

[Sina]

Our sun will just burn out and slowly turn into a Brown dwarf that will last approximately until the final entropy end of universe.

The sun will eventually be a white dwarf - brown dwarves usually refer to Jupiter-like objects, or burned-out red dwarves. Then after many billions of years it will cool into something like a black dwarf.

But if you like special effects you will see it expand into white giant for a while before it starts to lose fuel.
In that stage it will consume all inner planets and possibly Jupiter or more.

Red giant. We can only speculate about how far out it goes, but last thing I read (science paper thingy, that is, not popular article) was that it will probably not expand to reach Earth, although at the time Earth's orbit may start to degrade due to drag so that it eventually goes into the Sun anyway. I don't think Mars is in any danger of actual engulfage.

White dwarf? Only thing i heard that could be considered white dwarf is a Neutron star or a Pulsar that remains behind some Supernovas.....

And i distinctly remember that about white giant i think after red giant faze....but im not sure.

Anyway we are right. 8)