Explorer S-55 (satellite)

Explorer S-55 was a proposed, but ultimately unlaunched, satellite in the Explorer program. Its primary mission objective was to conduct micrometeoroid detection and impact studies in Earth orbit. The S-55 designation indicated it was a specialized or developmental mission within the broader Explorer series, focusing on a specific scientific area.

While the Explorer program overall successfully launched numerous satellites for various scientific purposes, Explorer S-55 was never brought to fruition. Specific details regarding the proposed design, instrumentation, and orbital parameters are limited, as the mission did not progress beyond the planning and development stages. The cancellation may have been due to budgetary constraints, technological challenges, or a shifting focus in NASA's priorities within the Explorer program. The data intended to be gathered by Explorer S-55 may have been acquired through other missions or alternative instruments.