Evidence of Alien Visitation in Earth's History

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The Earth's surface undergoes constant re-working over millions of years, making it difficult to find evidence of alien visitation from the past. Unless aliens visited very recently, there would likely be no trace of their presence, except perhaps in isotopic records in Strata. The speaker is not concerned about the Fermi paradox and believes there are other explanations. The speaker highlights the advancements in technology and funding that enable humans to finally explore and search for evidence of alien visitation, which has opened up opportunities for significant discoveries in various scientific fields in 2024.

Astrobiology has seen a series of revolutions over the past three decades that have completely reinvigorated the field. Scientists who were curious about life and biological organisms across the universe once had to handle the so-called giggle factor: the idea that they were kooky crazies searching for UFOs and little green men. With a dramatic improvement to the quality of our instruments and a torrent of new and better data, that giggle factor is now no laughing matter: we increasingly have the means to make progress here like never before.

My guest today is Adam Frank, the author of The Little Book of Aliens and a professor of astrophysics who is focused on improving our ability to identify biosignatures and technosignatures of life throughout the cosmos. He’s just one contributor to a growing community of scientists reinventing our approach to the search for life, a vitality that is leading to the potential first dedicated satellite focused on the search, the Habitable Worlds Observatory.

Alongside host Danny Crichton and Lux’s scientist in residence Sam Arbesman, we talk about the trilogy of revolutions that have brought new vigor to astrobiology, how artificial intelligence is upending the search for life, and what we can also learn about Earth and our climate in searching space for the answers of life.