Like a sea monster in ancient myth, this celestial beast can be seen by the ripples around it.
The 1915 theory, which is occasionally called Einstein's geometric theory of gravity, predicts that, as bowling balls placed on a trampoline create a depression, objects with mass cause the very fabric of space-time to warp. This curvature gives rise to the. And the greater the mass of a cosmic object, the more extreme the warping of space it causes.
Light travels across the universe in straight lines, but when it encounters a warp caused by a truly massive object, its path is curved. When the warping object is between and a background object, it can curve light in such a way that the apparent position of the background object is shifted., for example — light from the background source takes a different amount of time to reach Earth depending on how close it passes to the natural cosmic lens. , can make single objects appear at multiple points in the sky, often in stunning arrangements called Einstein rings and Einstein crosses.
The distortion caused by massive clusters like eMACS J1823.1+7822 can also help astronomers study mysterious, which accounts for around 85% of the mass in the universe but is invisible because it does not interact with electromagnetic radiation. Because dark matter does interact gravitationally, however, the lensing of light by a galaxy or galactic cluster can help researchers map the distribution of dark matter.
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