Despite being just outside Tucson, Arizona, Biosphere 2 looks almost like a colony on another planet.

Biosphere 2's latest mission: Learning how life first emerged on Earth – and how to make barren worlds habitable

Source: space
Source Link: https://www.space.com/astronomy/earth/biosphere-2s-latest-mission-learning-how-life-first-emerged-on-earth-and-how-to-make-barren-worlds-habitable