1 min readPreparations for Next Moonwalk Simulations Underway (and Underwater)Graphic depiction of the Mapping Alien Continents concept.Paul StankusPaul StankusBrookhaven Science AssociatesThe scientific goal of the proposed work will be reconstructing the image, ie resolving surface features, of an Earth-like exoplanet around a nearby star as seen in visible light. The innovation is in two stages. First, the design of a new kind of nulling interferometer — “dynamic hierarchical nulling” — combining inputs from multiple apertures and capable of separating star light from planet light with contrast of 10^10 or better in the visible. Second, combine the output beams from two such nullers on spacecraft stationed ~100km apart to achieve the required angular resolution using Michelson interferometric imaging; note that the hierarchical nuller preserves the star’s light in a separate beam which can then be used as in interference phase reference. The capability to survey the features of Earth-like exoplanets is perfectly aligned with NASA priorities and sure to excite public interest. 2026 SelectionsFacebook logo@NASATechnology@NASA_TechnologyShareDetailsLast UpdatedJul 21, 2026EditorLoura HallRelated TermsSpace Technology Mission DirectorateNASA Innovative Advanced Concepts (NIAC) ProgramNIAC StudiesResearch and Technology Mission DirectorateKeep ExploringDiscover More NIAC TopicsSpace Technology Mission DirectorateNASA Innovative Advanced ConceptsNIAC Funded StudiesAbout NIAC