3.75 billion years later, the Andromeda galaxy and the Milky Way staged a shocking collision. What will happen to the earth?

This1.50 million pixel photo covers at least 40,000 light-years of stars. In the image, these stars that look like gravel are stars, and the number of them reaches1.1.700 million. All stars may have a star system similar to the solar system. Then, will there be intelligent civilization in it, and is it also looking for civilizations of other planets?

This is the 432 regions of Andromeda galaxy photographed by Hubble Space Telescope in three years. Finally, about 3700 photos were used to synthesize this photo.

Andromeda galaxy is 2.54 million light-years away from the Earth and is the closest spiral galaxy to the Milky Way. It is located in the northeast sky and looks like a spindle-shaped oval spot, which can reach 8 times the size of the full moon in the night sky. It is also one of the most distant celestial bodies visible to the naked eye. Its diameter is 220,000 light years, at least 1.6 times that of the Milky Way, and it has about 1 trillion stars.

Spiral galaxies are the most numerous and beautiful galaxies in the universe.

It has a prominent core, usually in the shape of a lens, hiding a huge black hole. Outside the core, it is a thin disk with several huge spiral arms extending from the inside out, with an older yellow star in the middle and a younger blue star on the spiral arms.

Most of the gas and dust are also distributed in the tentacles of these galaxies. The whole looks like a vortex in a river, so it is called a spiral galaxy. All spiral galaxies are spinning, but their rotation speed is very slow. It takes about 230 million years for the Milky Way to complete a complete rotation.

The earliest observation record of Andromeda galaxy may come from Persian astronomer Al Su Fei, who described it as "Xiao Yun", and the mark on the map was also "Xiao Yun" at that time.

With the continuous improvement of human observation level, the observation of Andromeda galaxy is also deepening. 1925, astronomer Hubble finally confirmed that Andromeda galaxy is a huge spiral galaxy.

Because it is located in the north of the celestial equator, it is the main star in Andromeda and one of the largest members of the galaxy group, so it is directly named Andromeda galaxy.

At present, astronomers have observed that Andromeda galaxy is flying towards the Milky Way at a speed of 300 kilometers per second. In addition, due to the gravity between them, the two galaxies are actually accelerating their approach. Through calculation, the collision time given by scientists is 3.75 billion years later.

But according to the latest observation data of Hubble telescope, Andromeda galaxy collided with the Milky Way!

They found that the huge ring of Andromeda galaxy spans about 2 million light years. Halo is a huge gas mass wrapped around a galaxy. Although thin, it can be extended to far places. The Milky Way also has a halo. If you count the range of the halo, it means that it has met the Milky Way.

Of course, the main parts of these two galaxies are still separated, and it will take 3.75 billion years to truly merge into one. And will recombine after the collision. At that time, the sky scene of the earth will definitely change, and a large number of stars will appear.

From the perspective of the universe, this is both good news and bad news. The bad news is that there is nothing the Milky Way can do to avoid this collision. The good news is that this galaxy collision will not begin until billions of years later. So what impact will this collision have on the earth billions of years later?

In fact, for the earth, the impact exists, but it is not a big deal.

Let's look at the location of the solar system. The solar system is located in the remote area of the Milky Way, not in the main impact area of the collision. By the time the real collision happens, the sun is ready to enter the red giant stage, and it will be stronger than it is now. So from the earth's point of view, the obvious change may be the night sky, and the number of stars in the sky will increase.

Moreover, most stars and planets in the Milky Way are unlikely to be affected, because the two galaxies actually have enough spacious space, and many stars can easily pass by without being affected.

Besides, 3.75 billion years is too long. When the Milky Way collided with the Andromeda galaxy, perhaps human beings have disappeared and a new round of intelligent life has re-evolved on the earth. Perhaps at that time, human beings have reached the cosmic civilization and gone to a more distant universe.

In fact, such collisions between galaxies are not uncommon. Billions of years ago, when the distance between galaxies was much closer than it is now, collisions occurred more frequently, which was actually an important step in the evolution of galaxies.

When two galaxies collide, when the main parts meet, the big one will swallow the small one and the two will merge into one bigger one. Some star systems will be thrown out and become small galaxies wandering in the universe, but under the traction of gravity, they will still fly towards the nearby big galaxies and eventually be swallowed up.

1755, the German philosopher Kant proposed that there are infinitely many galaxies in the universe, and compared the universe to an ocean and galaxies to islands.

In our opinion, this statement is somewhat outdated, but it is a process of human understanding of the universe and celestial bodies. The extragalactic galaxy that we can easily see with naked eyes: Andromeda galaxy is an isolated island in the universe, which makes us feel the vastness of the universe and the smallness of human beings.