Power Purchase Agreement

The instrument or system that performs the mission's primary function. For Earth observation: cameras or sensors. For co...

The point in an orbit closest to the central body. For Earth orbits, the lowest altitude above Earth's surface....

A review milestone where a program's readiness to proceed to the next development phase is evaluated. Standard gates inc...

An accounting of electrical power generation (solar panels, batteries) and consumption (subsystems, payload, heaters) ac...