i do not know.Chinngy.i do not know.Chinngy.i do not know.
The Milky Way Colliding with the Andromeda Galaxy (simulation video)
*ignore the shitty quality of the gif
The Andromeda galaxy, our closest galactic neighbor and the largest galaxy in our region of the universe, is hurling toward the Milky Way at 300,000 miles per hour — almost 100 times faster than a speeding bullet. Why? Gravity. The two galaxies are close enough together to be pulled together by the force of gravity.
In approximately three billion years, a collision between the two galaxies will occur, creating an elliptical galaxy (our galaxy is currently a spiral), and the largest galaxy in the region. Here is a full simulation. As it shows, after the initial contact, the Andromeda galaxy will make a kind of U-turn, and head back for the full-scale collision.
Galactic collisions are not a phenomenon that never occur. Several have been documented. They are essential to the continual evolution of galaxies, and have been occurring since the birth of the universe. As Curtis Struck said, “Collisions are not the result of rare, chance encounters. Rather they are the inevitable result of the continuing, (hierarchical) growth of large-scale structure in the universe. That is, collisions are written into the initial conditions.”
What will happen to our solar system? Nothing. We’re far away enough from the center of the galaxy (where the volume of stars per measured area greatly increases) to bypass destruction. The space between each star is so significant, that most stars from both galaxies will slide past each other, untouched. To put this into perspective, imagine the Sun shrunk down to the size of a grain of sand on a beach. Now imagine that there are two miles between two grains. That’s how far you would have to walk from the grain of sand representing the Sun to the next closest grain of sand, representing the closest star, Alpha Centauri. That is a lot of space. Even binary stars have a sizable distance between them. So basically, star-on-star collision is not as common.
Actual collisions of matter will occur, but between clouds of gas and dust from both galaxies. These collisions will send compression waves, compressing the material within the dust and the gas closer together. When the gravity force pressing them together is great enough, stars will form. Some individually, others in clusters ranging from thousands to millions of stars.
The collision, like everything else in space, will not be quick by our definition. It will take hundreds of millions of years to complete. By the end, the stars will settle into new positions, and there will be no trace left of the collision, aside from a new galaxy.
So although our planet is safe during the collision, approximately two billion years after the collision commences, the Sun will expand into a red giant, most likely engulfing the Earth in its path.
Something to which to look forward. :-)
There’s more here.