World Solve

Current models rely on limited spectra from a small subset of planets, often with degeneracies in composition and cloud structure. High-resolution time-resolved spectroscopy and improved atmospheric retrieval algorithms are needed.

Kepler and other missions have identified thousands of exoplanets, but we lack robust statistics on Earth-size worlds with stable climates and liquid water. Next-generation transit and direct-imaging missions must refine occurrence rates.

Objects in the distant solar system could reveal formation history and the presence of rogue planets, but only a few have been discovered. Wide-field deep surveys and improved orbit determination are needed.

Planets ejected from their systems may roam the galaxy unbound, affecting models of planet formation. Gravitational microlensing campaigns can constrain their population.

Deep flows and core structure are difficult to infer. Gravity and magnetic measurements from orbiters can improve models.

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.

Identifying traces of methane, ozone, and water vapor simultaneously on rocky extrasolar planets remains at the limit of current telescopes. Space-based starshades and high-contrast coronagraphs are needed to resolve atmospheric details.

A host star is millions to billions of times brighter than a reflecting planet, blinding optical telescopes. Next-generation space interferometers and giant optical starshades are required to resolve exoplanet oceans and continents.

Atmospheric pressure and temperatures inside gas giants destroy probes long before reaching their cores. Advanced gravitational mapping, seismic sensors, and neutrino probes are needed to uncover their core states.

The solar wind strips away atmospheres from unmagnetized planets like Mars, but how it reaches supersonic speeds is unclear. Close-orbit solar probes and plasma simulations are needed to resolve acceleration dynamics.

Detecting a planet in a habitable zone is only a first step, and current tools can't yet confirm whether conditions there truly support advanced life. Refining this picture would sharpen the search for life beyond Earth.

We've confirmed thousands of exoplanets, but identifying which ones could truly support life requires data we mostly don't have yet. A clearer count would refocus the search for life beyond Earth.

Earth's magnetic field protects us from solar radiation, but the dynamo process that generates it deep underground is still only partly understood. This matters for predicting how long that protection will last.

Right now we can only detect exoplanets indirectly, through shadows and wobbles in starlight. Direct imaging would let us actually study alien landscapes and atmospheres instead of just inferring their existence.

Growing crops in space or on other planets means dealing with low gravity, radiation, and limited water and soil. Without solving this, any permanent settlement beyond Earth stays dependent on costly resupply missions.