Because people have measured and taken data by sattelite imaging and the like.
Eris is not bigger than earth
It is smaller than earth.
The Earth is not only larger but much more massive than the Moon is.
Formerly than answer was Pluto, whose moon Charon is just over half its diameter. Now that Pluto is technically not a planet, than answer is Earth, whose moon is just over a quarter its diameter.
No. Rhea has a mean radius of 764 km. Earth's moon has a radius of 1737 km.
Earth, by far.
If the moon was bigger than the Earth, than Earth would orbit it and, by our current definitions, it would be a moon.
Some scientists believe that the moon was once a chunk of the earth that broke off long ago and became our moon, and if that's true, it isn't possible that the moon would be bigger than the earth.
Yes, Saturn is much bigger than the moon of Earth.
The Moon is in fact much smaller than the Earth. The Earth is about 12750 kilometers (7930 miles) in diameter; the Moon is only 3470 kilometers (2160 miles). The Moon is also less dense than the Earth; consequently its mass is only 1/81 that of the Earth.
Earth is bigger than the moon, but that has absolutely nothing to do with the sun's corona.
The Earth is bigger than the Moon.
The Earth is much bigger than the Moon.
no the earth is bigger than the moon
The Earth is much bigger than the moon.
Not Earth's moon, but some moons of other planets are bigger than the earth (none in our solar system).
The Moon is smaller than the Earth