wdlang said:are all stars in some galaxy?
wdlang said:could anyone recommend some basic textbooks for me?
manojr said:While you wait to get references for textbooks, you can go through Wikipedia: http://en.wikipedia.org/wiki/Universe
There are a few possible explanations for a star not belonging to any galaxy. One possibility is that it was ejected from its original galaxy due to interactions with other stars or black holes. Another possibility is that it formed in a region of space with low density of gas and dust, making it difficult for a galaxy to form around it.
Yes, there is evidence for stars not belonging to any galaxy. These stars are known as intergalactic stars and have been observed in the space between galaxies. They are typically older, low-mass stars and can give us insight into the formation and evolution of galaxies.
Intergalactic stars are typically detected through their absorption of light from background galaxies. The light from these distant galaxies is distorted and dimmed as it passes through the space between galaxies, and scientists can use this distortion to identify the presence of intergalactic stars.
Studying intergalactic stars can provide valuable information about the evolution of galaxies and the distribution of dark matter. By studying the properties of these stars, scientists can also gain insight into the chemical composition and age of the early universe.
It is possible for a star not belonging to any galaxy to eventually form its own galaxy, but it is unlikely. The process of galaxy formation requires a large amount of gas and dust, which is typically found in the outskirts of existing galaxies. It is more likely for intergalactic stars to eventually be captured by a nearby galaxy than to form a new one on their own.