The film includes a dramatic illustration of possible in situ resource utilization: it depicts a hollowed-out Main Belt asteroid which could serve as a habitat for colonists and a space station for travelers who venture beyond the orbit of Mars. The interior cavity of the asteroid / habitat / station consists of a human-constructed, self-contained ecosystem, complete with pressurized, breathable air, land and soil, bodies of water, and clouds rotating around a periodic source of artificial sunlight.
