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Starshade Materials, Structures, and Space-Based Assembly: A Conversation with Christine Gregg
0:00:02 Future of Exoplanet Observation: With the James Webb Space Telescope operational, attention is turning towards the Habitable Worlds Observatory, designed to directly image Earth-sized planets around Sun-like stars.
0:00:22 Starshade Technology: Blocking the star's light is crucial for observing faint exoplanets (1/10 billionth the star's brightness). Options include an on-board coronagraph or a separate, large structure in space (a starshade).
0:00:43 Starshade Maneuverability: A movable starshade needs rigidity to quickly reposition and observe different stars, requiring new material ideas.
0:01:02 Christine Gregg's Research (NASA): Gregg, a researcher at NASA Ames Research Center, is working on a NIAC proposal exploring metamaterials for starshades. She is also working on a variety of materials, objects, structures, and topologies and how they can be manufactured in space.
0:01:11 Metamaterials: These involve bonding multiple materials to achieve specific characteristics, like increased stiffness for starshade stability after movement.
0:02:30 Structures and Materials: Gregg's long-standing interest. Additive manufacturing methods enable creation of meta materials with specifically designed substructures.
0:03:04 Metamaterial Definition. Generally, materials where the substructure (atomic, micron, or larger scale) is carefully designed by humans to give properties not found in nature.
0:04:37 Memory Metals: Another kind of meta material, like the ones being used on NASA's new Rover Wheels, that change to specific shapes.
0:06:10 Team Effort: Gregg emphasizes collaboration, combining expertise across different fields (e.g., electromagnetics) to create novel solutions.
0:06:31 Starshade Overview: A device to block starlight, enabling observation of faint light reflected from exoplanets, especially those in the habitable zone.
0:07:40 Competing Proposals: Another NIAC grant was awarded to John Mather for an inflatable starshade; Gregg's proposal focuses on assembly using metamaterials, complementing Mather's work.
0:08:51 Starshade Design Differences: Gregg's approach involves robotic assembly and deployment of elements, ultimately forming the same petal-like shape as deployable designs, but with potentially improved dynamic performance.
0:09:51 Dynamic Requirements: The Habitable Worlds Observatory starshade needs to settle very quickly during repositioning, requiring high damping.
0:10:18 Metadamping Materials: Materials that have twice the amount of damping as you would expect for a given stiffness.
0:10:48 Collaborators: Professor Sharif Tol (University of Michigan) and Professor Ofman (University of Texas at Austin) are working on "metadamping" materials with exceptional stiffness and damping properties.
0:12:55 Phase One Grant Goals: To provide NASA with specific recommendations and demonstrate the potential for robotic assembly and metamaterials to reduce mass and improve performance compared to deployable structures.
0:14:11 Space-Based Assembly The International Space Station shows on-orbit assembly, which is a potential building method.
0:15:15 Low Hanging Fruit Truss like structures are a good application.
0:16:35 Future Applications. Connecting modules and PCB assembly on orbit.
0:18:45 Digital Lattice Material: Focuses on assembling structures from injection-molded parts (e.g., octahedra connected by bolts), offering precision and material flexibility (aluminum, steel, carbon fiber-reinforced plastic).
0:20:58 Precision Advantage: Injection molding provides high precision, crucial for overall structure accuracy in space applications.
0:22:59 Future Build Method. A good first stage before implementing 3D printing in space is to simply send parts to space and have robots build.
0:23:40 Material Selection: Injection molding currently offers better manufacturing quality and material properties compared to 3D printing for certain applications.
0:27:05 Additional Resources: The speaker encourages viewers to explore a playlist of NIAC interviews for more mind-blowing ideas in space exploration.