This stunning irregular galaxy really looks strange and unusual but in fact, the galaxy NGC 6745 is the result of a collision between two galaxies, or more precisely an interaction, as a traverse of one by the other.
These two galaxies are crossed there are only a few hundred million years, can still be seen in the lower right edge of the image, a part of the second galaxy, the smaller being away, tearing by the way, a part of the large galaxy.
The great galaxy was before the cosmic collision, a spiral galaxy. It will take a few hundred million years to repair the tissue stellar and regain its original spiral.
It is likely that no star is back in a collision with another, however, gas, dust and ambient magnetic fields have interacted them directly to have the appearance of a cloud stretched by the wind.
The structures of the two galaxies have been altered by the "wind" of gravity.
The great galaxy had to absorb most of the interstellar medium of the small galaxy as it passes within it.
It is likely that the small galaxy passing was stripped of its gas and its interstellar dust.
Gravity that has torn the tissue stellar of the great galaxy, compressed dust and gas which is currently in the process of young stars born 10 million years (bottom right forming a bridge between the two galaxies).
Besides, we still see the traces in the form of a tear along NGC 6745. NGC 6745 spans about 80,000 light-years long, and lies in the constellation Lyra, 207 million light-years from the Milky Way, our Galaxy.
Image: Image of collision of galaxies insightful.
Collision and interaction of galaxies in NGC 6745 as seen by the Hubble Space Telescope.
Image Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA) - ESA/Hubble Collaboration Acknowledgment: Roger Lynds et al.