![]() ![]() "This effectively results in the magnification of the signal by a factor of 30, allowing the telescope to pick it up," co-author and Associate Professor in the Department of Physics at the Indian Institute of Science, Nirupam Roy, said. ![]() In the case of SDSSJ0826+5630, the radio wave signal was magnified by another galaxy between the early galaxy acting as a lensing body. Galaxies in early universe were surprisingly diverse, James Webb Space Telescope finds Milky Way's 'poor old heart' could reveal how our galaxy formed Astronomers weighed our Milky Way, and it's lighter than expected That means a tremendously massive object like a black hole or galaxy causes extreme curvature in spacetime just as a bowling ball would cause the extreme curvature of the rubber sheet in the analogy. General relativity suggests that objects with mass warp spacetime similar to how a ball placed on a stretched rubber sheet would weigh it down in the center, and just like in that analogy, the greater the mass, the more extreme the curvature. Gravity as a window to the early universe However, the team was able to make the record-breaking detection using a phenomenon predicted as part of the theory of general relativity, Einstein's geometric theory of gravity, first suggested in 1915. ![]() That means telescopes here on Earth need a natural boost to see long-wavelength, low-energy radio waves like the hydrogen line signal. The difficulty in spotting these wavelengths from more distant galaxies is due to the fact that as electromagnetic radiation from early galaxies travels vast distances to Earth, the expansion of the universe stretches its wavelength and causes its energy to reduce. Until now, it's only been possible to capture this particular signal from a galaxy nearby, limiting our knowledge to those galaxies closer to Earth." "A galaxy emits different kinds of radio signals. "It's the equivalent to a look-back in time of 8.8 billion years," lead author and McGill University Department of Physics Post-Doctoral cosmologist Arnab Chakraborty, said of the breakthrough in a statement. ![]()
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