Scientists working at the LIGO experiment in the US have for the first time detected elusive ripples in the fabric of space and time known as gravitational waves. There is no doubt that the finding is one of the most groundbreaking physics discoveries of the past 100 years. But what are they?
It has been a century since Einstein presented his theory of general relativity but it is still helping us unveil some of the deepest mysteries of the universe. Now the LISA pathfinder mission will prepare the way for us to study violent events that we’ve never seen before – such as the creation of massive black holes.