all of the ones in our solar system are...
Moons do not have to be any size but if the moon is bigger than the planet that it orbits, then the moon becomes the planet because it has more gravitational force.
Maybe it would have been bigger than Pluto, but that is not a planet anymore so I pretty sure No.More InformationOur moon is much smaller than any planet in our solar system. Earth's moon has about 1/50th the volume of Earth. The smallest planet in our solar system, Mercury, has nearly three times the volume and roughly 4 1/2 times the mass of our moon.
there is a moon for every planet
Although we don't know for certain, but it it highly likely that the Sun will be bigger than any planet. It is certainly bigger than all of the planets in our Solar System.
None. The sun is much larger than any planet.
No. Mercury orbits the sun, so it is a planet rather than a moon.
The term planet is based on a lot more than just size. Otherwise Ganymede, a moon of Jupiter would be a planet as it is bigger than Mercury and Pluto. Pluto is classed as a dwarf planet because it did not comply with the new rules. See related question for the classification.
Any of them because there is no set size for any of them. All of them are classified by different things and none of them are size. A moon orbits a planet, a planet orbits a star in a slightly elliptical orbit, a comet orbits a star in a highly elliptical orbit, and an asteroid is a planet or moon (any celestial object really) that is out of orbit and is flying through the universe a high speeds. For instance, a moon can be bigger than a planet.
Saturn
the moon
Yes, specifically the four largest, or Galilean satellites : Ganymede, Callisto, Io, and Europa. At 3100 to 5200 km in diameter, they are larger than Pluto's 2306 km diameter, and are correspondingly greater in mass. The large moon of Saturn, Titan, is also larger than Pluto. In fact, Ganymede and Titan are larger than the planet Mercury, but not as massive.
We have not yet discovered any planet that is 1 million times bigger than the earth. The sun is approximately 1 million times larger than Earth by volume, but it is a star far larger than any planet.