Does it matter? Scientists have come one step closer to solving an age-old mystery first theorised by Einstein. But some think there are certain disadvantages to having our heads in the stars.
Scientists hear the hum of the universe
Cosmic orchestra: Scientists have been documenting radio waves from exploded stars for 15 years. Glossary
Black holes - A region of space where gravity is so strong that nothing can escape from it, including particles and radiation.
General relativity - A theory that was developed by Albert Einstein between 1907 and 1915, which explains gravity and the effect of objects on one another. According to general relativity, the observed gravitational effect between masses results from their warping of spacetime.