What is Gravitomagnetism?
Gravitomagnetism, a theoretical idea around since 1918, is a predicted consequence of general relativity, from which it was derived. Its existence has been experimentally proven, but allegedly only once, and there are certain variants of the effect that are supported by the evidence to greater or lesser degrees. An international team claimed to discover the effect in the mid-90s, based on data from the LAGEOS I and LAGEOS II spacecraft. The measured effect was within 10% of that predicted by general relativity, although some scientists still doubt the validity of these results. In 2004, Stanford physicists launched Gravity Probe B, an extremely delicate gyroscope package, to measure gravitomagnetism in outer space with much greater precision. Its data is currently being analyzed. After Einstein presented his theory of general relativity, it took decades to work out all of its predicted consequences. The most famous is the fundamental equivalence between matter and energy, demonstrated
