![]() ![]() Time passes at different rates in stronger or weaker gravitational fields, and the amount of that time difference needs to be taken into account. Similarly, the curvature of space itself is smaller the farther away you get from a large mass, and being more than 20,000 kilometers up above the ground puts you in a significantly weaker gravitational field than someone on Earth’s surface. Even though these relative speeds are very slow compared to the speed of light, even a small omission, like a miscalculation in the signal’s arrival time of a microsecond, can lead to an error in your calculated position by the size of a football stadium! Meanwhile, anyone on the surface of the Earth is experiencing the effects of Earth’s rotation, which range from about 1,670 km/hr (1,040 mph) at the equator down to zero at the north or south poles. Up in space, these satellites orbit Earth at significant speeds: 13,900 kilometers-per-hour (8,600 mph). You have to remember why relativity - both the special and general versions - are so important. Gravitational redshift is one of the core predictions of Einstein's General Relativity. Only if gravitation itself is linked to not only mass but energy, too, does this make sense. conserve energy when it falls in, it must be blueshifted. When a quantum of radiation leaves a gravitational field, its frequency must be redshifted to. ![]()
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