We will not be able to colonize space until we develop an entirely self-contained environment (one which starts with a limited amount of air, food and water and recycles them over and over and over again - automatically.)
We will not be able to colonize space until we develop an entirely self-contained environment (one which starts with a limited amount of air, food and water and recycles them over and over and over again - automatically.)
The common name for such a system is "The Earth"!