There are 3, Saturn, Neptune, and Uranus
It Is the planet with most rings in the whole solar system
You can see the whole solar system and its moons on NASA's Solar System Exploration website (solarsystem.nasa.gov). It provides detailed information on each planet, its moons, and various missions exploring our solar system.
Pluto is the smallest and the coldest planet in the whole Solar System.
The unique habitable planet in the solar system, possibly the unique in the Milky Way, and possibly in the whole Universe.
Not in our system. The sun makes up almost 99.9% of the whole solar systems mass.
The difference is semantic; the solar system is the collective identity of all bodies considered together as a whole, i.e., the Sun, planets, etc.; whereas the bodies would refer to each of those making up the solar system: the planet Neptune for example is "a" body in the solar system.
Venus is the prettiest girl in the whole solar system.
No. The asteroid belt is an area where there are more asteroids than in other parts of the solar system It is not a planet, nor is there enough mass in the asteroid belt to form a whole planet.
There are a lot of ways to explore the solar system. Some people, like NASA, see the solar system in stars by the Hubble Telescope satellite. But that satellite only checks the Earth. In order to explore the whole solar system, you must travel to Mars, Jupiter, Saturn, Uranus, and Neptune (Pluto is not considered as a planet in the solar system in this answer). If you want, you can also explore Venus and Mercury. But you cannot land on Mercury, especially on Venus (the hottest planet in the solar system). So now astronomers/astronauts only explore Mars - Neptune.
Yes, It holds the whole solar system together.
Eris with a mass of 1.7×1022 kg.
A nuclear bomb explosion on Earth would not have any significant direct effects on the solar system as a whole. However, the impact on Earth's environment, climate, and ecosystems could have indirect consequences that may affect the planet's position within the solar system.