1. A system for mapping a surface of a celestial body containing objects and terrain, comprising: a Synthetic Aperture RADAR (SAR) module configured to capture an image of the terrain of at least a portion of the surface; a map module configured to store map data representing the portion of the surface; and a fusion module coupled to the SAR module and the map module, wherein the fusion module comprises a processor configured to: receive the image and the map data, and combine the image and the map data to generate a new map of the portion of the surface.