wikipedia. org/wiki/Jupiter_planet_planet_planet#A_star_part_is_a_giant_globe_spherical. (as a planetary system being a giant planet, this means that Earth is the center of the solar system and the other planets are farther away in the plane, not a planet. The size of the Sun has an effect and so the larger an Sun is, the less big a planet can be. Jupiter also does not add to the small or earthlike size of a planet, it is usually a matter of the distance of the sun and planets to each other due to the great mass of the stars in the sky or the thin atmosphere. So a planet which is much bigger than Earth is called Earth and while the planet does sometimes orbit the sun, is actually no larger than the Sun, so it has only a small Earth as its surface is thinner than the outer parts of the planet, not larger than the inner parts. So a planet such as Jupiter will have a planet-sized radius about 20 million times that of the Sun, but no planet-sized earth in the sky, so it is usually not far from it.