Who’s checking out this “mini Earth” in Arizona? 🌎 In 1991, eight researchers spent two years sealed inside Biosphere 2, making it one of the most ambitious scientific experiments ever conducted. While the mission faced unexpected challenges, it provided valuable insights into closed ecosystems and helped shape research for future space exploration. Today, you can walk through this one-of-a-kind research facility and experience its incredible environments for yourself. 📍Biosphere 2 | Oracle, Arizona #Biosphere2 #ThingsToDoInArizona #ArizonaAttractions #Tucson #WelcomeToArizona