what are gravitational wave. what is space time
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gravitational wave
nounPHYSICS
plural noun: gravitational waves
an energy-carrying wave propagating through a gravitational field, produced when a massive body is accelerated or otherwise disturbed. Gravitational waves were first postulated by Einstein in 1916 and were first observed directly in September 2015.
"experimenters report the first detection of a phenomenon that has been long predicted: bursts of gravitational waves generated by cosmic collisions of black holes"...
space-time
/speɪsˈtʌɪm/
nounPHYSICS
the concepts of time and three-dimensional space regarded as fused in a four-dimensional continuum.
"the curvature of space-time"...
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