Repository of problems worth solving
World Solve is a public institutional repository for identifying real unresolved problems across science, society, health, governance, economics, and local systems. Each entry is intended to be citable, inspectable, and actionable.
Publicly citable
Every problem has a stable citation code for reference and discussion.
Filtered by relevance
Search by category, geography, status, and keywords.
Builder-oriented
Use the repository to find startup ideas, policy leads, and research agendas.
4194Total
4194Open
0Solved
9Humans
open
Global / Unspecified, Global
Hydrogen and oxygen boil off due to solar radiation in orbit, prohibiting long-duration storage for deep space stages. Advanced active cryocooling, sunshields, and zero-boil-off insulation technologies are required.
science-space
global-unspecified
boil
off
storage
cryogenic
liquid
propellants
rapidly
during
long-term
orbital
climate-environment
long
society-governance
safe
technologies
smallholder
open
Global / Unspecified, Global
To achieve high efficiency, nuclear thermal engines must run hydrogen propellant at temperatures over 2,500 K, which corrodes reactor cores. Development of advanced ultra-high-temperature carbide and nitride nuclear ceramics is vital.
climate-environment
global-unspecified
nuclear
thermal
propulsion
reactors
suffer
rapid
degradation
fuel
elements
extreme
lack
science-space
systems
continuous
verification
solutions
open
Global / Unspecified, Global
Miniaturized satellites often burn out early because standard thrusters are too large or heavy for 1U-6U form factors. Micro-electrospray and green propellant systems must be scaled up for commercial CubeSat fleets.
science-space
global-unspecified
systems
small
cubesats
lack
propulsion
capable
major
orbital
plane
changes
society-governance
climate-environment
technology-computing
economics-resources
early
real
open
Global / Unspecified, Global
Permanently shadowed craters at the lunar poles reach -240°C, making metals and polymers brittle and prone to shattering. Special cryogenic-resistant alloys and thermal insulation jackets are required.
society-governance
global-unspecified
lunar
reach
permanent
night
regions
near
absolute
zero
causing
severe
industrial
scale
propellant
structural
long
lack
open
Global / Unspecified, Global
Without gravity, liquid fuels float randomly inside tanks, causing air bubbles to enter fuel pumps during orbital refilling. Scalable fluid-settling systems and bladderless zero-g fuel transfer ports must be built.
science-space
global-unspecified
transfer
in-orbit
propellant
between
moving
spacecraft
microgravity
unstable
fuel
gravity
haven
whether
climate-environment
make
philosophy-ethics
mathematics-logic
open
Global / Unspecified, Global
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.
climate-environment
global-unspecified
launches
high-altitude
rocket
deposit
light-absorbing
black
carbon
directly
stratosphere
frequent
frequency
hole
cannot
science-space
A persistent gap exists in realizing practical, scalable solutions for industrial-scale lunar propellant and structural material production. Scientific understanding, engineering readiness and institutional capacity remain insufficient to translate promising concepts into durable impact under real-world constraints of cost, skills and governance.
society-governance
asia
malaysia
industrial-scale
lunar
propellant
structural
material
production
deployable
technologies
persistent
gap
solutions
systems
methods
scalable
enabling
