In 2525, many of these freighters were independent and used for commercial and civilian use. They are relatively simple craft, with large storage bays and rotating sections. The rotating sections contained water tanks that would automatically irrigate crops grown in the hydroponics bay in the middle carousel section of the vessel. They could carry enough food and water to supply a small city.
- A parabola is an algebraic graph that has one point of extrema and extends infinitely at the ends, forming a U shape.