No, nobody has ever left the solar system.
Voyager One and Voager Two have both passed beyond the orbit of Pluto.
Since we do not have any laws that indicate what a solar system should look like (as an example we know the normal / average / typical characteristics of a human) there is no basis to claim that a solar system is unusual.
Without extensive support and equipment, not in our solar system
Yes. There are no stars in the Solar System besides the Sun but there are over billions of stars out of our Solar System.
Yes, Billions of people do each day. The Earth is a planet :-)
In any solar system; that's what planets do.
It is not any distance from it. Our solar system is in the Milky Way.
They would - if there was a black hole in our Solar System - but there isn't one.
Capella is a star, so it is not itself a solar system. Our sun is not a solar system, but it is part of the solar system along with the planets, moons, comets, asteroids and other objects. If Capella has any of those things, then it is part of a solar system.
There are no galaxies in our, or any other, solar system. They are far too large.
The solar system is not part of any other star system. It is part of a galaxy called Milky Way.
No. The moon is in the solar system. The only star in the solar system is the sun. All other stars are much farther away than any object in the solar system.