If aliens exist, here’s how we’ll find them

Childish seamless pattern with aliens faces ufo. Sci-fi pattern on dark background. Hand drawn doodl...

On a desolate planet 3.5 billion years ago, a molecule copied itself. The clone copied itself, too, and so did its clones.

And one day, molecules and cells and multicellular organisms copied themselves and reproduced, eventually becoming flying birds, swimming fish, and two-legged, complex beings known as humans.