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The evidence is indirect because astronomical black holes don't emit any electromagnetic radiation and hence the name black. However, Einstein's theory tells us that they must emit gravitational radiation. Although this radiation has not been observed directly, there is ample evidence that gravitational waves are responsible for speeding up certain astronomical binaries, the most famous being the Hulse-Taylor binary.
Gravitational waves - a Universal phenomena
In fact any accelerating mass will emit gravitational waves in much the same way as an accelerating charged particle emits electromagnetic radiation. Even as you move your hand and mouse to read this web page your movements emit very weak gravitational waves. These gravitational waves are similar to light and radio waves in many respects and carry energy from their sources.
Radio waves are easy to detect and observe and our radio and TV antennas do this all the time. The reason they are able to do this is because radio waves interact very strongly with charged particles, namely free electrons in the antenna. Unlike radio waves, gravitational waves interact with all forms of matter - both charged and neutral - but their interaction is far weaker than radio waves.
A world wide effort is now on to detect gravitational waves; black holes could well be the first to show up in this new window of observation called Gravitational Astronomy.
One of the most interesting predictions of the General Theory of Relativity is that this changing curvature can travel through space, much like a wave across water. If we spin a paddle in water, waves travel out across the surface of the water. The Earth orbiting the Sun is just like a paddle spinning and stirring up spacetime so that gravitational waves.
A gravitational disturbance that travels through space like a wave. This type of wave is analogous to an Electromagnetic Wave. Gravitational waves are given off by most movements of anything with mass. Usually, however, they are quite difficult to detect. Physicists are currently working hard to directly detect gravitational waves. Experiments like LIGO and LISA are designed for this purpose.travel out across spacetime.
These gravitational waves are similar to light and radio waves in many respects and carry energy from their sources.
Unlike radio waves, gravitational waves interact with all forms of matter - both charged and neutral - but their interaction is far weaker than radio waves.
In the very (very, very, very...) early universe, all the the forces of nature (gravity, electromagnetism, the strong nuclear force, and the weak nuclear force) were all combined into one force known as the Superforce. Matter and energy were not separate forces as they are today. Space-time was folded, compressed, squashed, and bent to fit into.
By 10-35 seconds, the Superforce had already split up into to forces: gravity and the Grand Unified Theory (GUT). The GUT combined electromagnetism, the strong nuclear force, and the weak nuclear force. Temperatures had fallen to 1027 K. Here, the GUT split into the strong nuclear force, and the electroweak force, along with the rapid formation of quarks, leptons, and their anti-matter equivalent components. When this happened, the universe went through a short but very large expansion. Space-time began to unfold its self and spread out faster than the speed of light. This lasted for 10-32 seconds before the universe resumed it's previous rate of expansion.
Gravitation is responsible for keeping the Earth and the other planets in their orbits around the Sun; for keeping the Moon in its orbit around the Earth; for the formation of tides; for natural convection, by which fluid flow occurs under the influence of a density gradient and gravity; for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena observed on Earth.
A theoretical physicist has presented research that shows bacteria might transmit electromagnetic signals to produce species-specific wavelengths. According to research presented by Northeastern University physicist Allan Widom, based on existing knowledge of DNA and electrons, bacteria can indeed communicate.