No. The planets vary greatly in both size and mass.
No, the mass of a planet and its size are not the same. Mass refers to the amount of matter in an object, while size refers to the physical dimensions of the object. A planet's mass is determined by the total amount of material it contains, while its size is a measure of its physical dimensions.
venus and earth
If the planet is smaller, then it can't have the same size. If you assume that a smaller planet has the same density as Earth (and therefore less mass), its surface gravity will be smaller. If you assume that a smaller planet has the same mass as Earth (and therefore more density), its surface gravity will be greater. This is because we would be closer to the planet's center - or to the planet's matter in general.
Venus. Earth and venus are virtually the same size and have the same mass.
Neptune is almost the same size as Uranus. Both planets are similar in diameter, mass, and composition.
no planet has an atmosphere like ours! Sorry! Fun Fact: Venus is the same size and mass as Earth!
Gravity differs on different planets because it is determined by the mass of the planet. The larger the mass, the stronger the gravitational pull. Each planet has a unique mass and size, resulting in different levels of gravity on each planet.
Venus is the planet closest in mass to Earth, with a mass about 81% that of Earth.
There is no planet that has the same size moon as the planet. This is only possible if Pluto was still a planet.
Venus is closest to the Earth in size and mass. Its diameter is around 95% of Earths, while its mass is around 81.5% of Earths.
Neptune is the closest in radius to Uranus, at about 740km or 3% smaller.
The distance between a planet and an object affects the gravitational force between them. That means the size of a planet affects the value of the "surface gravity" for that planet. The greater thedistance from the surface to the center of the planet, the smaller the gravity at the surface (for the same planet mass). An example is the fact that Mars and Mercury have almost exactly the same surface gravity. Mars has more mass than Mercury, but this is balancedby the fact that Mercury hasthe smaller radius.