NASA scientists published a study on this. It’s not as straightforward as one might think: https://www.theatlantic.com/science/archive/2018/04/are-we-earths-on

NASA scientists published a study on this. It’s not as straightforward as one might think: https://www.theatlantic.com/science/archive/2018/04/are-we-earths-only-civilization/557180/ https://www.theatlantic.com/science/archive/2018/04/are-we-e... Link to original paper within the article.