Get there with /warp moon Meteorites are found on The Moon, they fall from the sky from time to time. Keep an eye out for the meteorites in chat! There will be a message that pops up and tells you approximate coordinates of where the meteorite landed!
Be careful! Meteorite's sometimes have barrels that are guarded by powerful mobs! Barrels contain special treasures such as Ethereal Fragments, Nether Stars and other things like diamonds!