In 2018, an astrophysicist introduced the Silurian Hypothesis, the idea that an advanced civilization may have existed on Earth before humans.

https://www.msn.com/en-us/news/technology/in-2018-an-astrophysicist-introduced-the-silurian-hypothesis-the-idea-that-an-advanced-civilization-may-have-existed-on-earth-before-humans/ss-AA1AdgdM