the actule date of the milky way/Andromeda collision is 3-5 BILLION years from now, and the actual event will consist of the two galaxy's passing through one another, over a further billion or so years, with the individual stars passing each other by several light years. if more than a dozen star systems are directly effected, I will be surprised. Even in the most violent galactic mergers, the distances between the stars remain so great, that gravitational effects on a stars planets remain negligible. what will be affected are the great interstellar gas clouds, when two gas rich spirals collide, their gasses become violently disrupted and compressed, triggering an orgy of star birth. this rapidly consumes all the available gas in the newly formed elliptical galaxy, effectively ending its ability to ever form new star systems in the future. As the stars in Milkymedia run through their life cycles and die, the galaxy will become redder and dimer, as only the low mass stars are left alive. After about 30 billion years, with no new stars to replace them, only the feeble red dwarfs will still be burning.blindthrall said:Melon Hunter said:The Andromeda Galaxy is accelerating towards our own due to gravitational attraction. The hole in the logic here is it will take millions of years for the collision to happen, and even when it does happen they will merge without a catastrophic explosion because the average density stars in a galaxy is so low.thats it exclamation said:haold on whats all this about a crash with andromeda?? where did this come out of
5 million years to be exact. I don't think we can get a sustainable foothold in another galaxy that's not Andromeda, which is the closest one, within that time frame. We're talking about ridiculous distances that make 5 million years seem like a blink. Also, I know stars won't actually crash into each other, but the chaos from all those different gravitational fields will rip planets from orbits and slam others into stars. Once Mildromeda stabilizes, the new galaxy may well be habitable, but any existing advanced life will be gone. Even if Earth is only nudged a little closer or farther from the sun, we'd all die. To say nothing of whether or not the new orbit is stable.
So long story short, both galaxy's will remain perfectly habitable throughout the ordeal, its only billions of years after the fact that we really get screwed over.