# Is gravity made of particles or waves?

Gravity can't be described in terms of either particles or waves.

Although it's a good approximation, Isaac Newton's description of gravity as an attractive force between masses left many unanswered questions, including how the force is propagated.

We now know that the universe can be described in terms of four dimensional space time. Before the theory of relativity was developed, the universe was thought to be three dimensional space and time to be a steady flow from the past to the future.

Gravity is explained by Albert Einstein's field equations.

Time slows down in curved spacetime, and gravity is the result. Therefore, gravity is not a force; rather, gravity is the result of curved spacetime.

Gravitational waves, which have recently been detected, are predicted by general relativity as well. When two massive objects, like black holes, collide, spacetime is bent, causing very small waves to be sent through it.

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The general theory of relativity defines gravity as the curvature of spacetime due to mass and energy, rather than being made up of particles or waves as is the case with particle theory.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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