Of course, there's more than one life form in this universe
Our own galaxy has between 100 and 400 billion stars; there are hundreds of billions of similar galaxies in the OBSERVABLE Universe, and it is believed that the entire Universe is much, much bigger than the observable Universe (how much bigger, is not known). It seems that at least a large percentage of those stars have planets, which means they can be called "solar systems".
No. Of course not. The universe is big enough to hold earth and all the other planets in the Milky Way Galaxy and all other galaxies and the sun and the moon and the stars. There is no way that the universe could be smaller that Earth. =)
Population II stars are the oldest in our Milky Way. Population III stars were the first stars in the Universe, but have yet to be discovered. See related question
The entire solar system is in the milky way, with all the stars you can see.
No. The Milky Way galaxy is just one of billions of galaxies in the Universe. Just like there are billions of planets in the Milky Way Galaxy, there are also comparable numbers of planets in other galaxies.
According to what Carl Sagan that is true
The Sun is one of approx. 200 billion stars in the Milky Way galaxy.
No. Our own galaxy contains several hundred billion stars (each of which might be a solar system), the observable Universe contains hundreds of billions of galaxies, and it seems that the entire Universe is much, much bigger than the observable Universe.
None that we know of. The Milky Way is a bit larger than the average galaxy, with somewhere between 500 billion to a trillion stars (it's difficult to know, because there are an unknown number of small and invisibly dim red or brown dwarf stars). We don't believe it possible that any single star to be much larger than about 150 solar masses.
Yes, actually there are trillions of other galaxies with stars, and planets in the universe.
Yes. A group of stars called a galaxy. One of billions in the Universe. An awesome thing it is too. Truly awesome.
Yes, the Milky Way is much much larger than our Sun. The Sun is part of the Milky Way, and is one of over 200 billion stars in the Milky Way.