The universe is billions of years old. If, in the future, humanity were to explore the galaxy and visit other planets around other stars, we might be visiting places where at one time, an advanced civilization once existed. However, if such a civilization existed, it might have been millions of years in the past. If that was the case, how would we even know that it existed? Also, what if we ask that same question of Earth rather than of alien worlds?Learn more about the Silurian Hypothesis on this episode of Everything Everywhere Daily.SponsorsExpedition Unknown  Find out the truth behind popular, bizarre legends. Expedition Unknown, a podcast from Discovery, chronicles the adventures of Josh Gates as he investigates unsolved iconic stories across the globe. With direct audio from the hit TV show, you’ll hear Gates explore stories like the disappearance of Amelia Earhart in the South Pacific and the location of Captain Morgan's treasure in Panama. These authentic, roughshod journeys help Gates separate fact from fiction and learn the truth behind these compelling stories. InsideTracker provides a personal health analysis and data-driven wellness guide to help you add years to your life—and life to your years. Choose a plan that best fits your needs to get your comprehensive biomarker analysis, customized Action Plan, and customer-exclusive healthspan resources. For a limited time, Everything Everywhere Daily listeners can get 20% off InsideTracker’s new Ultimate Plan. Visit InsideTracker.com/eed.Subscribe to the podcast! https://link.chtbl.com/EverythingEverywhere?sid=ShowNotes--------------------------------Executive Producer: Charles DanielAssociate Producers: Peter Bennett & Thor Thomsen Become a supporter on Patreon: https://www.patreon.com/everythingeverywhereListen on Podurama: https://podurama.comUpdate your podcast app at newpodcastapps.comDiscord Server: https://discord.gg/UkRUJFhInstagram: https://www.instagram.com/everythingeverywhere/Facebook Group: https://www.facebook.com/groups/everythingeverywheredailyTwitter: https://twitter.com/everywheretripWebsite: https://everything-everywhere.com/ Learn more about your ad choices. Visit megaphone.fm/adchoices