Galaxies are stars, but are all stars still in the galaxy? Are there stars that are not connected in the Milky Way?
This is an interesting question. And yes, the answer is that stars are in the intergalactic space, the “empty” space between galaxies and other galaxies. Stars such as these are called “Wandersterne” or homeless stars.
Even the stars have no house. But do you know how a star can be outside of a galaxy? Apparently, according to the StarChild NASA page, several factors are responsible for this situation. Let’s talk one by one.
First the companion of the stars
The stars of a galaxy are usually members of a binary star system in which two stars revolve around their mass center.
Stars also have a life cycle. As you get older, the stars get bigger and eventually explode into a supernova.
In a system of double stars, when one of the stars explodes in a supernova, everything around it will be affected by the explosion, causing the companion to die and the very fast distance to the universe. In fact, the speed can reach around 1000 kilometers per second, enough to escape the galaxy.
This is one of the things that moves a star outside of its parent system.
Second, Black Hole Sucked
Wait, isn’t it like the black hole has to be hit? How can the sucked star move away from the universe?
Here we discuss the previous binary system. When a binary system approaches a black hole, one of the stars in the system is sucked through the black hole, while the other gets a “kick” because of the extreme effects of gravity.
The speed of gravity of the beaten star allows him to escape from his breast milk system. These stars are called hyper-fast stars.
Third, clashes of galaxies
According to astronomers, this unique process is the most common process that makes stars homeless.
In the event of collisions or interactions between two galaxies, the stars of any galaxy can be scattered by galaxies under the influence of extreme gravity. According to ScienceMag, these stars then roam the intergalactic space to become roaming stars.
Such stars were also observed with the Hubble space telescope. Astronomers just need to determine how many of these stars can exist in the universe.
Okay, from the three statements above we know that stars outside the Milky Way originally belonged to galaxies. Can traveling stars form outside the Milky Way? The answer: no.
The scientific reason is that it takes a lot of dust and gas to form a star. This large source of dust and gas can only be found in galaxies, remains of ancient stars that have exploded in supernovae. No stars form without dust or gas.
The fact is that some stars are outside the galaxy, but they may not be too numerous compared to the number of stars in the galaxy.