None.
However, dwarf planets Pluto and Charon are sometimes referred to as a binary system.
In our solar system, Venus is. We don't know about other systems yet.
saturn the 5th planet from the sun is the lighest planet in the solar system.
The name of our planet is the Earth. The name of our moon is the Moon. The name of our solar system is the Solar System. I capitalize them, because when used as names, they are proper nouns. This also helps us distinguish between the planet Earth and earth (meaning soil), between the Earth's Moon and moon (meaning the natural satellite of a planet), and between our Solar System and any other solar systems (since any system containing a star and a planet or a planet-forming disk can be called a solar system.) The Milky Way is the galaxy that contains our Solar System.
Jupiter is the largest planet in the solar system.
Jupiter is the largest planet in our solar system.
Uranus is the third largest planet in the solar system.
The largest planet in the solar system is Jupiter. Jupiter also has the largest moon in the solar system, Ganymede.
Olympus Mons on the planet Mars is the largest known volcano in the Solar System.
They are in all three. Planets are in solar systems. There are lots of solar systems in a galaxy. There are lots of galaxies in the universe. So any planet is in a solar system, a galaxy and the universe.
Jupiter, Saturn, Uranus and Neptune, in this solar system. No doubt there are millions more in other solar systems.
When Pluto was still officially considered a "planet" in our solar system, it and it's moon Charon were considered by many to be a double planet system. Whenever a moon constitutes a considerable percentage of the host planet's mass, it may be considered a double planet system. For this reason, some consider the Earth and our moon to be a double planet system. Our system has by far the greatest planet to moon mass ratio; about 6:1. As for planets outside our solar system, I cannot say. Though there are many out there.
In our solar system, Venus is. We don't know about other systems yet.
No. The largest planet in our solar system is Jupiter, which is about 1.5 times the size of Saturn (including the ring systems). Saturn is the second largest planet in the system.
There are about 408 multiple-planet solar systems in our galaxy. The orientation of these solar systems are on a flat plane due to lacking giant planets, where as ours is tilted off the solar system's plane because of Jupiter's gravitational influence..
Neptune is our 8th planet in the solar system!
They're rotating bodies, so... the moons around a planet would also be systems.
8th planet in the solar system