Gravity is a fundamental force of nature that causes objects with mass to be attracted to each other. It is often described as the force that pulls objects towards the center of the Earth. According to Einstein's theory of general relativity, gravity is the result of objects bending the fabric of space-time.
Yes, there is overwhelming evidence from various experiments and observations that support the idea of gravity being an attractive force. For example, the orbits of planets around the Sun, the motion of celestial bodies, and the behavior of objects in free fall all demonstrate the attractive nature of gravity.
No, gravity is a unique force that cannot be explained by any other known force. While other forces, such as electromagnetism and the strong and weak nuclear forces, can also cause objects to attract or repel each other, they do not act in the same way as gravity and cannot fully account for its effects.
The strength of gravity between two objects is determined by their masses and the distance between them. The greater the mass of the objects and the closer they are to each other, the stronger the gravitational force between them. This relationship is described by Newton's law of universal gravitation.
No, there is currently no evidence to suggest that gravity can be repulsive. All observations and experiments indicate that gravity is an attractive force. However, some theories, such as string theory, propose the existence of repulsive gravity, but this has not been proven or observed yet.