Are all the stars we see in space at night time suns from different solar systems?
Yes and No… Almost all of the stars you see at night with the unaided eye are stars within the Milky Way Galaxy. A few of the things that you see are actually galaxies themselves. With a good telescope you can see many, many more galaxies, and each of those galaxies contain billions of stars in addition to the 200 billion plus stars within our Milky Way Galaxy. Each of those stars could have from 0 to 10 planets orbiting around it, along with their own assorted moons. We cannot see the majority of those planets because of the brilliance of the individual stars. However, recent developments in deep space research has uncovered a technique for discovering exoplanets and so far Astronomers and Scientists have cataloged 234 of them orbiting fairly close by stars. At this time the technique is only good for locating very big planetary bodies which might compare to our Jupiter, Saturn, and Neptune. In time maybe the process may be refined enough to detect planets the size of Mercury, Venus