Final answer:
Gravity is a force that acts between any two masses. While the gravitational force is usually small, it becomes significant when one or both of the objects have a large mass.
Step-by-step explanation:
Gravity is a force that acts between any two masses. While the gravitational force is usually small, it becomes significant when one or both of the objects have a large mass. For example, the Moon and a satellite in Earth's orbit experience a strong gravitational force due to their masses. Another example is two stars in a distant galaxy, which also experience a strong gravitational force due to their large masses. On the other hand, the gravitational force between two people standing on Earth or between a car and a bicycle on a road is relatively small because their masses are much smaller compared to astronomical objects.