The most difficult to detect and significant waves.

According to general relativity, when an object accelerates, it will interfere with the gravitational field and radiate gravitational waves, which is like throwing a stone onto the surface of a calm water. Therefore, any object radiates gravitational waves all the time, which is everywhere in the universe. For example, when the earth moves around the sun, it will give off gravitational waves. As a result, the earth loses energy and gradually moves closer to the sun along the helix. In that case, why are we not aware of its existence?

The answer is that gravity is actually the weakest force we know. The electromagnetic force that keeps the atom as a whole is 1000 trillion billion billion than that of gravity, that is, 10 ^Thirty-nine ) times. The only reason why we feel gravity is that the earth is so huge that the gravitational pull of countless particles that make up the earth is cumulative. But gravitational waves are the weakest and least noticeable waves in nature, and they do not produce any effect that we usually perceive.For example, when the earth revolves around the sun, the energy lost by the radiation gravitational wave is only about 0.001 watts, so it is close to the distance from the sun in billions of years. If 50 billion asteroids, 1 kilometers in diameter, hit the earth at a speed of 10 kilometers per second, the gravitational wave energy generated can only light a light bulb. But no one can live to see this result.

The key equipment of Virgo

The upper left is the "Virgo" detector. It will send gravitational waves to the signal. The upper and middle plans and the upper right picture are two parts of the super shock absorber. The shock absorber will isolate the equipment from external disturbances.

Of course, more massive mass redistribution will produce stronger gravitational waves, such as a star collapsing into a black hole, or two stars colliding, which may produce gravitational waves that we can detect. But even so, it is extremely difficult to detect gravitational waves directly, and it can be said to be a great challenge to human intelligence.