Relativity has been continuously worked on for the last century. It's not "old", it's current. Gravity waves are a prediction of relativity. LIGO was built to

Relativity has been continuously worked on for the last century. It's not "old", it's current. Gravity waves are a prediction of relativity. LIGO was built to confirm they exist. It took a long time to build LIGO and a long time to make it work. But eventually it did work in 2016 and sure enough gravity waves exist: https://www.ligo.caltech.edu/ https://www.ligo.caltech.edu/ https://en.wikipedia.org/wiki/LIGO https://en.wikipedia.org/wiki/LIGO Black holes are a prediction of relativity. But black holes weren't imaged until 2019: https://en.wikipedia.org/wiki/Black_hole https://en.wikipedia.org/wiki/Black_hole https://solarsystem.nasa.gov/resources/2319/first-image-of-a-black-hole/ https://solarsystem.nasa.gov/resources/2319/first-image-of-a... The predictive power, the depth of the results, and the work it takes to confirm the predictions of relativity is all a testament to Einstein's genius. If anything, Einstein is underrated.