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New research could help scientists use gravitational lensing — the warping of light from distant galaxies — to investigate the accelerating expansion of the universe.
Scientists are still coming up empty in the hunt for flaws in Einstein’s theory of general relativity that could explain the mysterious force driving the accelerating expansion of the universe.
The researchers studied 100 million galaxies looking for signs that the strength of gravity has varied throughout the universe’s history or over vast cosmic distances. Any sign of such a change would indicate that Einstein’s theory of general relativity is incomplete or in need of revision. Variation could also shed light on what dark energy is, beyond that it’s the name scientists give to whatever is causing the expansion of the universe to accelerate.
Despite finding no such variations in gravity’s strength, the work will help two forthcoming space telescopes — the the European Space Agency’s Euclid mission and NASA’s Nancy Grace Roman Space Telescope — also hunt for changes in the strength of gravity through space and back through time.
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An artist’s interpretation of Einstein’s theory of general relativity. (Image credit: coffeekai via Getty Images)
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