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
Supermassive - Having a mass many times larger than that of the sun.
Pulsars - A celestial object that emits regular pulses of radio waves and other electromagnetic radiation.
Entity - A thing with independent existence.
Theory of Relativity - General relativity is the basic idea that instead of an invisible force that attracts objects to one another, gravity is a warping of space. The more massive the object, the more it warps the space around it.
Socrates - Considered by some to be the greatest philosopher in history, Socrates is credited with developing the whole notion of critical reason.