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Unresolved mistery: What is the speed of Gravity?
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[quote:Anonymous Coward 75084354:MV8zNTQ0NDkzXzYzNTAyMzExXzhCNjc5ODNE] WORSE YET!! For almost a century, since DeForest invented the triod (an amplifier of current based on the flow of electrons in circuits) every circuit had capacitors (Faraday), inductors (Gauss), resistors (Ohm) and transistors or tubes (DeForest, Shockley). You had simple and complex circuit boards stacked to make more complex things, and everything was based on the flow of electrons (voltage, current, noise). In a very short period of time, since 1990 or so, more and more parts of circuit were embedded in silicon first and in a MEMORY after that. With the widespread of DSP (Digital Signal Processors), all of the previously used components were replaced more and more by LINES OF SOFTWARE. The key was the conversion of analog to digital signals and the opposite. As of today, DSP and ADC/DAC works at Gigaherts speeds, and are replaced almost ALL analog circuitry based on electrons flows with BITS!! So, using the math theory of radio design, today you have SDR (Software Designed Radios) like your smartphone. The conversion from analog to digital and the opposite are now performed at the very edge of an antenna. Transistors are used only to amplify received signals to a level at wich they can be digitalized with an ADC. After that, everything is a matter of software based DSP. The same with the transmiting side, except for the final part where you use a power transistor to transmit signals (as in your smartphone). And the ELECTRONS?? Where are they? Were transformed to BITS? So a BIT is a PARTICLE?? NO. It's all about models and theories. You use what you have at hand at a given time. Now, we almost DON'T NEED electrons for radiotransmission, except at the front end. As you can see, there are no universal laws. There are MODELS (theories) that we use to understand things, measure them and construct things. So, if electrons were important in electronic circuits, flowin several meters in complex equipment, now they have been replaced by line of codes that use THE SAME THEORY but in a virtual way. It has to shock some of you, don't you think? We've replaced an elementary particle by BITS!! [/quote]
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If a star explodes, the radiation waves (X, gamma, etc.) would reach Earth at the speed of light (assume a constant "c" vakue).
But what about gravity? Gravitational waves weren't included in Einstein body of work.
Just recently, some gravitational waves were sensed, but no speed has been measured yet.
Are the gravity effects instantaneous?
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