About one third of the solar systems gravity is contained in the sun.
The Solar System
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No. The Milky Way is much, much bigger than our Solar System - and it contains billions of solar systems.
That is backwards, galaxies are much larger than solar systems.
The Universe is much larger, and contains many solar systems.
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Solar tides are usually hidden by lunar tides. The moon's gravity is greater than the sun's
All the ones in OUR solar system seem to have lots of moons; this is probably not so much a characteristic of "gas giant" planets, but of large planets in general, with high gravity. We know nothing, as yet, about the moons of the hundreds of planets in OTHER solar systems. We hardly know anything about the planets.
Pluto has a weaker surface gravity than a planet because it has much less mass than a planet has.
Galaxies do occur IN Solar systems. Galaxies are much much bigger than solar systems. This means that solar systems are found in Galaxies. The Galaxy we live in is called the "Milky Way Galaxy". The Milky Way is a barred spiral galaxy 100,000-120,000 light-years in diameter containing 200-400 billion stars. Each star is potentially a solar system like our own. NOTE: we can see that outside the Milky Way there are hundreds of billions of other Galaxies.
No. The gravity on Mars is only about 38% of that on Earth, so you would be much lighter there. Of the planets in this solar system, only Jupiter's gravity would stand any real chance of doing harm.