Predicted by Albert Einstein but yet to be observed. Not so easy to explain either. These waves can stretch you and the whole planet which sounds a bit scary but you won’t even notice. In fact, it’s just a few years since we have had the ability to build a detector sensitive enough to (possibly) find a wave. The detectors are called Laser Interferometers and there are four of them already:
It’s so difficult to detect a gravitational wave that scientist were fooled to believe they had found one in 2014. That discovery quickly fell apart. Therefore we can expect that next time it will be thoroughly scrutinized before announced. There are rumors that there has been a discovery by the LIGO team, we just have to wait until it is confirmed.
Why not let Neil deGrasse Tyson at StartTalk explain: