All around us.
The stars you see at night still exist.
Yes, stars really exist. One example of a star is the sun in our solar system.
Yes, stars can exist outside of a galaxy. These stars are typically referred to as intergalactic stars, and they may have been ejected from their original galaxy due to interactions with other stars or galactic dynamics. Intergalactic stars are typically found in the space between galaxies.
At the centre of stars.
If our sun did not exist the other stars would be little different from the way they are. The sun is just one of billions of stars in the galaxy. Many of the stars we see in the sky are larger than our own sun.
Nubula does not exist.
Outside our (Milky Way) galaxy.
By their gravitational effects.
Elements which exist in stars exist also in humans, the concentrations are very different. An exception is helium, an element without biological significance.
Anonymous
All of the stars you see at night are suns.
Mainly inside of galaxies.