What is the difference between a world and a planet I love my trucker to the moon and back shirt? Is the disparity in size the only thing that qualifies the candidates as moons? Being the size of Jupiter it sounds like a binary planet system I do not know the technical term. All worlds are planets but not all planets are worlds. Moons are classified by their orbits. If the barycenter of the two orbiting bodies stays inside the diameter of the more massive body then it’ll be considered at the planet-moon system. Otherwise, it’ll be a binary planet system. If the more massive object is a Jupiter mass and the lesser object is a Neptune mass, then it can easily be a planet-moon system. Wouldn’t a moon with a solid surface then count as a world?
Thank you, I love my trucker to the moon and back shirt. I suppose I can google my next question about whether they must have an equal mass for the barycenter not to be within the larger body. Moons orbit large bodies in space that are not stars. Planets orbit stars, moons orbit planets. Size relation between the two bodies isn’t as important until your talking about Pluto sized bodies. Relevant to your question about whether the two objects have to be of equal mass, the answer is no. If of equal mass, the barycenter would be exactly half the distance between the two.