An asteroid half the size of a football pitch will pass by earth late Friday. But there's no cause for alarm -- astronomers say there's no chance it will hit us.
A spacecraft on a mission to study the origins of life and the solar system has arrived at an asteroid. Japan's Hayabusa 2 will collect samples before returning to Earth.
After three and a half years of flight, the Hayabusa2 probe will reach the asteroid Ryugu. Its task: Collect asteroid dust. The German landing device MASCOT is also on board. It's due to land on Ryugu in October.
Trump said that the new force will become the sixth independent branch of the US military. He also signed a directive to try and reduce debris in space "to the common interests of all nations."
NASA experts worry that cold temperatures and a lack of sunlight could damage the rover Opportunity. The space agency has not been able to communicate with the rover for several days.
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