the effect it has on other planets
They are all solid masses, i.e. not gaseous bodies like the outer planets.
If you know know the molar masses of the reactants in a chemical reaction you can determine the molar masses of the products because the combined molar masses of the reactants equals the combined molar masses of the products.
But you CAN determine the size of the planets: in diameter, overall mass, and in density.
The forces of gravity between two masses are the cause of all orbits.
the planet has moons or satellites orbiting around it. By observing the orbital motion of the moons, scientists can calculate the mass of the planet based on the laws of gravity and motion.
Planets
They all have mass, and masses are attracted to each other.
The outer planets are primarily gaseous meaning they are basically just gargantuan masses of gas.
Jupiter
Yes, any planet can have satellites. Gas planets actually have the most satellites due to their large masses.
they are all soild masses and mecury, venus, earth, mars
Their mass is. Gravitational force is a force between masses.