Why does an astronaut weigh less on the moon than on earth?
a. the astronaut has less mass on the moon.
b. the astronaut is farther from earth's center when he or she is on the moon.
c. the gravitational field strength is less on the moon's surface than on earth's surface.
d. the astronaut is continually in free fall because the moon orbits earth. please select the best answer from the choices provided?