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<!--{{short description|Aspect of relativity in physics}}--> ...tational waves result from his [[general theory of relativity]] as ripples in [[spacetime]].<ref>{{cite web |last=Finley |first=Dave |title=Einstein's gr ...

{{unsolved|astronomy|Could life have arisen elsewhere?<br />What are the [[Abiogenesis ...[Drake equation]] speculates about the existence of sapient life elsewhere in the universe. The science of extraterrestrial life is known as [[astrobiolo ...