Researchers are using black holes to test Einstein's theory of gravity, with some studies examining gravitational wave signals to assess the theory's validity. The results of these tests are not entirely consistent, with some outlets suggesting that Einstein's theory has been proven correct, while others imply that it may be wrong or has yet to face its toughest test. Further testing, including the use of future black hole images and observations of stars near black holes, may help determine the theory's accuracy.