Scientists have discovered a new way to 'listen' to black hole collisions. This method uses gravitational wave signals to detect the collision of black holes. Scientists hope to learn more about the universe with this discovery. **What are Gravitational Waves?** Gravitational waves are ripples in space-time caused by the movement of massive objects. Scientists are trying to learn more about the universe by studying these waves. **Astrophysical Calibration** Scientists use gravitational wave signals to detect black hole collisions, a method called astrophysical calibration. This method uses very sensitive instruments to measure gravitational wave signals. **The Size of Black Holes** Scientists have discovered that supermassive black holes are smaller than expected. This discovery helps scientists learn more about the universe. **Did You Know?** There is still a lot we don't know about the inside of black holes. Scientists are trying to learn more about the inside of black holes. **Questions Kids Might Ask** What is the inside of a black hole like? What do we know about the inside of black holes? Scientists are trying to answer these questions. **How This News Affects Kids' Lives** This news helps kids learn more about the universe. Kids can start to understand how the universe works with this news. **Conclusion** Scientists have discovered a new way to 'listen' to black hole collisions. This discovery helps scientists learn more about the universe, and kids can start to learn more about the universe too.