So far, all experiments have ended with crews running low on oxygen and fighting each other. This is a problem if we're to ever reach Mars.
The strange story of a decades-long quest to recreate Earth in miniature and why it’s integral to our future as a species on and off the planet.
Here’s what happened when Trump’s chief strategist was given a mock Earth.
Environmental doomsayer TC Boyle discusses his new novel 'Terranauts', based on the real-life Biosphere 2 experiment.