The universe is not static or silent, as is commonly believed. It moves, expands and… vibrates. And this is where gravitational waves play an important role: tiny ripples in the fabric of space and time that occur when massive objects accelerate or collide.
Gravitational waves are generally very difficult to detect because they are usually very short and weak, and get lost in the background noise of the universe.
For this reason, until now only some of them have been captured with very sensitive instruments such as the Laser Interferometer Gravitational-Wave Observatory (LIGO), which measures the distortions caused by the waves in two laser light beams separated by kilometers.
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