* Gravity is not a "property" of mass in the same way that electromagnetism is a property of light. Electromagnetism is the fundamental force that governs the interaction of charged particles. Light is a specific type of electromagnetic radiation.
* Gravity is the force of attraction between any two objects with mass. It's not a property of mass itself, but rather a consequence of the presence of mass. Think of it like this: mass is the ingredient, and gravity is the recipe.
* The analogy between gravity and light isn't accurate. While both are fundamental forces, their nature and properties are quite different. Light is a wave (and a particle) that travels at the speed of light. Gravity, on the other hand, is a force that acts over distance and is described by Einstein's theory of general relativity.
Here's a better way to think about it:
* Mass creates gravity. The more mass an object has, the stronger its gravitational pull.
* Gravity acts on mass. Objects with mass are attracted to each other by the force of gravity.
So, while it's true that gravity is intimately connected to mass, it's not a property of mass in the same way that electromagnetism is a property of light. Gravity is a force generated by mass, and that force acts on other objects with mass.