Nasa is adding an extra mission to its Artemis programme before it attempts to land astronauts on the Moon for the first time in half a century.
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The Artemis IV and V missions in 2028 will use whichever landers are deemed ready for service. If only one company's lander is available, that lander would be used for both missions, an official said. If both are available, one would be used for one flight and one for the other.