Leading young scientists give engaging reviews of their research areas and exciting visions of future developments.

What Is Closed Ecological Systems A closed ecological system is an ecosystem that provides for the maintenance of life through complete reutilization of availab

More than four decades have passed since a human first set foot on the Moon. Great strides have been made in our understanding of what is required to support an

To begin implementation of the Vision for Space Exploration (recently renamed "United States Space Exploration Policy"), NASA has begun development of new launc

In recent years, planetary science has seen a tremendous growth in new knowledge. Deposits of water ice exist at the Moon's poles. Discoveries on the surface of

In January 2004, President Bush announced a new space policy directed at human and robotic exploration of space. The National Academies released a report at the