The hunt for alien life has been given a boost after scientists discovered a habitable planet almost the same size as Earth.
Astronomer Thomas Barclay from Nasa's Ames Research Centre in California made the discovery using data collected by the Kepler space telescope.
The unnamed planet was found orbiting an unidentified star in its so-called Goldilocks zone - a region around the star that emits just enough energy, light and temperature for liquid surface water to appear.
R2, which has been on the ISS since 2011, has a mission: clean handrails, vacuum air filters and take air-flow measurements. The problem is it doesn't yet have the ability to learn and complete the work. So NASA is looking for someone to teach the bot. The Robonaut Challenge calls on contestants to write algorithms that allow R2 to interact with a training dashboard the space agency built.
Space agency scientists are developing two separate mission concepts to assess, and learn how to exploit, stores of water ice on the moon and other lunar resources. The projects — called Lunar Flashlight and the ResourceProspector Mission — are notionally targeted to blast off in 2017 and 2018, respectively, and aim to help humanity extend its footprint out into the solar system.