What are galaxies? “A galaxy is an enormous collection of a few million to trillions of stars, gas and dust held together by gravity. They can be several thousand to hundreds of thousands of light-years across.” 1 All the stars that we see, observe, or use to guide us through direction, they all belong to one galaxy, and that galaxy is our own Milkyway. At some dark night, you could observe a fuzzy, cloudy strings of very dense stars those are the “disk and bulge”.
The result of gravitational force:
As mentioned earlier in the definition, a galaxy is held together by gravitational force, which means that every galaxy has its own gravitational force acting on it. When galaxies come ...view middle of the document...
In fact stars are very far away that the collision between them are very rare.
“In fact, the Milky Way Galaxy is colliding with the Sagittarius Dwarf Galaxy right now” 2 In additional to our milky way collision, the Antennae galaxies which is made up of two spiral galaxies, are also in the progression of collision, and as mention the process take hundreds of millions of years.
“When two galaxies interact, clouds of gas inside each galaxy may become compressed.” 2 Compressing clouds could lead to collapse of galaxy under their own gravity, as a result transform into stars “This process can lead to a burst of star formation in interacting galaxies, leaving a new generation of stars in a galaxy where normal star formation may have ceased long ago.” 2
The history of galaxies collision:
The topic of “Galaxies colliding” in the 1970s was so strange that people never believed it; they considered it a myth, until François Schweizer came in the late 1970s, and presented his theory of the newborn star clusters as the outcome or result of those collisions. This made him the first discoverer of galaxies collision. Some astronomers...