# Harnessing Gravitational Energy: A Power Source Abundant Throughout the Universe

• Mirza90
In summary, gravitational energy is a potential energy that can be used to power things, but it is not a continuous/perpetual power source. We will probably have to move outside our own solar system to use a gravitational system in this fashion.

#### Mirza90

In the world we live in, we can convert and use energy in the form of radiation and turn it into a significant power source. Gravitatoinal energy, which exists throughout the whole universe could be used someday as a power source. Think of it. A power source abundant throughtout the universe.

I need some feed back if I'm just spit balling or any helpful research would be greatly appriciated.

tidal flow is driven by gravity
and fairly eazy to capture [in some places]

water dams use gravity too in rivers

so we useing some gravity to make power now

Mirza90 said:
In the world we live in, we can convert and use energy in the form of radiation and turn it into a significant power source. Gravitatoinal energy, which exists throughout the whole universe could be used someday as a power source. Think of it. A power source abundant throughtout the universe.

I need some feed back if I'm just spit balling or any helpful research would be greatly appriciated.
Welcome to PF. I think you have a fundamental misunderstanding of what gravity and gravitational energy are. Gravity is not radiated energy, it is an attraction between two objects due to their mass bending space. A book sitting on a table is affected by gravity forever, with a constant force, but no energy is exchanged between the book and table/earth.

Gravitational energy is a form of potential energy. A book sitting on a table has more gravitational potential energy than a book sitting on the floor below the table. But the only way to use this energy is to move the book from one location to to the other. And obviously, once you've moved the book from the table to the floor, you've used up the difference in potential energy. To use it again, you have to give back the energy you gained to lift the book back up to where it started. In this way, gravitational energy is conserved.

So gravity itself is not and cannot be a continuous/perpetual power source any more than a spring or a battery can be a continuous/perpetual power source. Power plants that use differences in gravitational potential energy - ie, hydroelectric dams - are not really powered by gravity, they are powered by something else, typically the sun.

Note: ray_b's example of tidal power isn't even truly gravity power: While tidal power uses the tides as a driver, the energy really comes from slowing down the Earth's rotation.

Mirza90 said:
In the world we live in, we can convert and use energy in the form of radiation and turn it into a significant power source. Gravitatoinal energy, which exists throughout the whole universe could be used someday as a power source. Think of it. A power source abundant throughtout the universe.

I need some feed back if I'm just spit balling or any helpful research would be greatly appriciated.
Well, the fundamental thing that needs to be understood for making use of energy is thermodynamics: whenever the entropy of a system increases, it is possible to extract some energy out of that system to do directed work. Naturally, gravitational systems offer the capacity to help in this regard. The primary problem is that we will probably have to move outside our own solar system to use a gravitational system in this fashion.

One pipe dream, for example, is making use of a black hole: if you drop matter into a spinning black hole, a portion of that matter is shot at very close to the speed of light out the poles of the black hole. Imagine the uses: a society that lives around a black hole might dump their waste products into the black hole, and extract energy from the high-velocity stream of subatomic particles that results. And the energy in that stream is nearly equivalent to the mass-energy of the matter that was dropped into the black hole!

Of course, it won't last forever. The matter that is dropped in takes away from the angular momentum of the black hole. Eventually it will stop spinning, and no more useful energy can be extracted.

## 1. What is gravitational energy and how is it harnessed?

Gravitational energy is the potential energy stored in an object due to its position in a gravitational field. It can be harnessed by using a device called a gravitational energy converter, which converts the potential energy into usable kinetic energy.

## 2. Is gravitational energy a renewable resource?

Yes, gravitational energy is a renewable resource as it is constantly replenished by the gravitational pull of celestial bodies in the universe.

## 3. How does harnessing gravitational energy compare to other renewable energy sources?

Harnessing gravitational energy has several advantages over other renewable energy sources. It is available everywhere in the universe, making it more reliable and consistent. It also does not require any external inputs, such as sunlight or wind, to generate energy.

## 4. Can gravitational energy be used to power large-scale systems?

Yes, gravitational energy can be used to power large-scale systems. In fact, some proposed methods for harnessing gravitational energy involve using the gravitational pull of massive objects, such as planets or stars, to generate large amounts of energy.

## 5. Are there any potential drawbacks or limitations to harnessing gravitational energy?

One potential drawback of harnessing gravitational energy is the initial cost and technological challenges involved in building and maintaining a gravitational energy converter. Additionally, the amount of energy that can be harvested may be limited by the strength of the gravitational field in a particular location.

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