Millions of pieces of debris are flying around in space and pose a huge collision danger to new spacecraft. Manuel Metz from the German Aerospace Center (DLR) talks about the battle against space junk.
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A big piece of space junk is hurtling earthwards - China's defunct Tiangong-1 space lab. The out-of-control module is expected to reenter the atmosphere by Monday morning GMT when most or all of it will burn up in a fireball visible to the naked eye.
"Why build one when you can have two at twice the price?" So goes the famous line (and government potshot) in the sci-fi film "Contact." But sometimes, having two of something in space is far, far better than one.
Elon Musk's SpaceX has delivered a pair of satellites into orbit that will measure subtle fluctuations in the earth's gravity. The German Center for Geosciences and NASA jointly funded the mission.
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