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Orbiting spacecraft could be refueled with water taken from planetoids—but some experts doubt the economics.
The president wants humans to explore the solar system by 2025–but his plan faces hurdles in the Senate.
Moon and Mars missions are scrapped, but radical new technology gets funding.
Are astronauts close to extinction?
Reduced government funding could scuttle some projects.
A successful launch moves commercial space companies toward human spaceflight.
Such a rocket would dramatically reduce the costs of spaceflight—a promise NASA’s space shuttle failed to deliver on.
Firms look to provide automated landers and inflatable modules.
A new robotic arm uses electroadhesion to clamp onto virtually anything it finds.