well since astronomers cant see all of space its impossible to andswer but the biggest in our solar system i believe is Ganymede of Jupiter, in the galaxy the largest is appartently also ganymede
The largest planetary satellite is the earth's moon.
Ganymede is the largest known moon in the Milky Way Galaxy.
Asteroid, moon, planets, solar system, universe
Neptune's largest moon is Triton and its smallest (as of 2010) is Psamathe.
The universe can be organized in various scales: Planetary system (e.g. our solar system) Galaxy (e.g. Milky Way) Galaxy cluster (group of galaxies) Supercluster (groups of galaxy clusters) Observable universe (everything we can potentially observe)
Earth's moon would have been the first moon discovered. Galileo observations identified four of Jupiter's moons - Io, Europa, Ganymede, Callisto - in 1610.
The Moon is the planetary body that orbits the Earth.
If you mean NATUERAL sattelite like a moon then it would be ganeymede which orbits Jupiter!
The largest non-planetary body in the solar system is Ganymede, one of Jupiter's moons. Ganymede is even larger than the planet Mercury and is the only moon known to have its own magnetic field.
There are probably infinitely many moons in the universe that are bigger. However, our moon is unique in our solar system. It is (not counting Pluto's moon Charon) the largest moon in proportion to the size of its major planet host. Otherwise it will be the Jupiter's biggest moon Ganymedes,the biggeset moon in term of mass and density in our solar system!
William Hartmann has: Played himself in "Horizon" in 1964. Played Himself - Planetary Sciences Institute, Arizona in "The Planets" in 1999. Played himself in "If We Had No Moon" in 1999. Played Himself - Planetary Science Institute, Arizona in "The Planets" in 1999. Played himself in "The Universe" in 2007. Played himself in "Catastrophe" in 2008. Played Himself - Phd., Planetary Scientist in "How the Universe Works" in 2010.
Moon is not a planet - It is a satellite. Several planets in our solar system have moons (one or more) that happen to have names. Our moon doesn't have one. The coldest planet in our solar system used to be Pluto until it was demoted from the planetary status. Now it is Uranus.