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Gravitational Waves: The New Window to the Universe,ntly detectable gravitational waves are only those produced by very massive cosmic sources with large accelerations. Such waves travel unhindered through space and produce only tiny effects on the Earth.

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Future Gravitational Wave Detectors,le binaries and a gravitational wave background. We describe three such missions, LISA, TianQin?and DECIGO, as well as the LISAPathfinder?which was launched to test technologies needed for LISA. We end by describing Pulsar Timing Arrays?for the detection of gravitational waves with frequencies?as low as a hundred millionth of a Hertz.

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Electromagnetic Radiation: The Key to Understanding the Universe,e electromagnetic radiation?coming from astronomical sources, we can determine their properties like mass, temperature, distance, size, chemical composition, radial velocity, age and magnetic field. Almost all our knowledge of the Universe obtained till 2016 came through the study of electromagnetic

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Gravity: The Force that Governs the Universe,ce-time, produced by matter and energy. Einstein’s theory is compatible with special relativity and it agrees with Newton’s theory when gravity is weak as in the Solar system. It is able to account for a small discrepancy in the observed orbit of the planet Mercury compared to the orbit predicted by

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Christine Erlach,Michael Müllerrk. The discovery verified Einstein’s century-old prediction and enabled for the first time the direct detection of a black hole and a black hole binary system. It also opened the new window of gravitational wave astronomy to the Universe, which until then could be observed only through electromagne