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As Nasa prepares to retire its fleet of space shuttles, it is encouraging private companies to build new rockets to get its astronauts into orbit. Among the firms landing huge contracts to build the next generation of spacecraft is SpaceX. Science correspondent David Shukman visited the company's rocket factory in California for a look inside the prototype capsule.

During the last space shuttle flight, astronauts will test a new method for recycling 'used' water. Water is essential for life, and having access to water beyond Earth will be a major obstacle for future space explorers.

Imagine a cell phone battery that charges with every step you take or a spacesuit that uses astronauts' expended energy to run the suit's electronics. A team of college students conducting NASA research on this innovative use of nanotechnology took their research to new heights. The team, comprising Hannah Clevenson, Olivia Lenz and Tanya Miracle, flew an experiment related to their nanotechnology research on a NASA reduced-gravity flight.

Private US company SpaceX hopes to put an astronaut on Mars within 10 to 20 years, the head of the firm said.