The environments in space habitats and on the Earth are both closed-loop systems, only on vastly different scales. When you purchase through links on our site, we may earn an affiliate commission.

Space combat games vary in focus, but those centered on battles offer immersive, visceral experiences for players seeking action-packed gameplay. Games like Power Of Ten, Lovers In A Dangerous ...

Nuclear thermal propulsion, which uses heat from nuclear reactions as fuel, could be used one day in human spaceflight, possibly even for missions to Mars. Its development, however, poses a challenge.