A student claims that all objects exert a gravitational force on one another. However, it is difficult to observe the effect of the force of gravity unless the mass of one of the objects is very large Which observation best supports the student's argument?
A
The moon stays in orbe around the Earth
B
Earth spins on its axis at a constant speed
С
The masses of the moon and the Earth are constant
D
The Solar System has moons of different masses
i