Gravitational Waves
Gravitational Waves are ripples in the fabric of spacetime caused by some of the most violent and energetic processes in the Universe, such as the collision of black holes or neutron stars. These waves were first predicted by Albert Einstein in his general theory of relativity and were directly detected by the LIGO and Virgo observatories in 2015. The study of gravitational waves offers a unique way to observe and learn about the most extreme events in our Universe, providing insights into their properties and dynamics. As such, it is a vital component of cosmological research, allowing scientists to explore the nature of dark matter, dark energy, and the expansion history of the Universe.