Last updated on June 23, 2019
The Milky Way was formed about 12.6 billion years ago. After a long period of development, the Milky Way eventually formed a bar-shaped galaxy with a diameter of about 150-200,000 light-years. Despite its long history, the Milky Way did not really enter the old age. Looking at the laws governing the development of galaxies, the galaxy will have a long evolutionary period to finalize!
Our classification of the Milky Way in the Hubble tuning fork belongs to the SBb type, which was previously thought to be the SB model like the Andy Galaxy! The Milky Way is the second largest in the Galaxy in the Milky Way, and the Fairy Galaxy is more than 220,000 light years in diameter! The size of several major members of this galaxies group:
Andromeda: about 220,000 light years in diameter
Milky Way: about 150-200,000 light years in diameter
Triangular galaxies: about 70,000 light years in diameter
Large Magellanic Cloud: about 20,000 light years in diameter
Small Magellanic Cloud: about 15,000 light years in diameter
Pisces dwarf galaxies: 10,000 light years in diameter
Don’t think that the Milky Way is the second child to be complacent. In fact, compared with other larger galaxies, the Milky Way is not as good as one hair:
Compared with IC101, the Galaxy really has only one point, but it is not arrogant. It is similar to the Sun. Although it is not big, it still exceeds more than 90% of the stars in the Milky Way! However, there is a more important indicator. I don’t know if you have discovered that more than 90% of the stars in the Milky Way are smaller than the sun, which means that most of them have entered the ranks of red dwarfs. When a red dwarf star of a galaxy is the vast majority. At this time, the galaxy should also enter the age of aging, because the future of the red dwarf will not exceed the new star, and there will be no more next generation after this generation! But don’t worry, the Galaxy now produces dozens of stars every year, which may not be a big deal in the universe, but at least it shows that our galaxy still has a very strong vitality!
The larger scales are not compared one by one. The Milky Way is not the biggest, but it is not the smallest. It is an old and young galaxy. On the cantilever of Orion, which is 26,000 light years away from the silver heart, there is a group of people who have not yet crossed. The low-level civilization that is developing in the galaxy, although its current level is very low, seems to be developing at a speed beyond imagination, because about half a century ago, not even crossed the planet, but now It seems that something is different. The farthest tentacle has touched the edge of the star star stellar wind…
But just crossing the solar system is not enough. The universe is very big…. We have to go out and do it!