Gravitational Waves and LIGO

Description:  Gravitational waves are disturbances in the fabric of spacetime and are generated by accelerated masses. Gravitational waves were predicted by Albert Einstein's general theory of relativity but were measured for the first time in 2016 by two LIGO and Virgo observatories. These first waves originated from two merging black holes 1.3 billion light years away. This cutting edge phenomenon can be used to introduce gravity as a fundamental force and to give a sense of scale of the Universe.

Web Resources:  Gravitational Waves - Wikipedia, LIGO - Wikipedia