World Solve

Transit times to Mars and the outer planets require months to years of flight, increasing risk and cost. Breakthrough high-thrust, high-Isp propulsion systems—such as nuclear thermal or plasma engines—are critical.

Next-generation telescopes and gigawatt-scale space solar power arrays are too large to fit in single rocket fairings. Highly coordinated multi-robot assembly systems operating in microgravity need to be developed and standardized.

Rigid aeroshells are constrained by rocket fairing diameters, limiting landed mass to around 1-2 metric tons. Deployable or inflatable aerodynamic decelerators are needed to land heavy human habitats safely.

Collecting samples from Venus or deep Martian canyons requires multi-stage rockets launching autonomously from foreign surfaces. Lightweight planetary ascent vehicles and automated orbital rendezvous systems must be built.

Primary mirrors for space telescopes cannot exceed launch vehicle dimensions without complex, failure-prone mechanical folding. Dynamic fluidic mirrors and membrane optics created in orbit offer a promising alternative.

Frequent commercial launches risk disrupting the ozone layer and altering upper-atmosphere global thermal dynamics. Clean-burning propellants like methalox or hydrogen-based engines must be evaluated for environmental impact.

Commercial point-to-point rocket or scramjet transit is limited to ocean routes due to severe atmospheric shockwaves. Low-boom aerodynamic shaping and active acoustic damping technologies must be developed.

Almost all current reusable rocket technology is built for missions close to Earth, while deep space missions still rely on expensive, largely disposable hardware. Extending reusability further out could reshape space exploration economics.

Every kilogram of fuel launched from Earth adds enormous cost to a mission. Producing fuel on-site from ice or soil could make deep space missions dramatically more affordable.

Reusable rockets have cut costs, but they still require significant repair and inspection after each landing. True rapid reusability, like an airplane, would make space travel dramatically cheaper.