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Once I've read a science-fiction novel and the only thing I remember is the following:
In the story there is a sphere (the size of a moon?) which drifts trough space. Whenever it encounters a planet with intelligent/space-faring beings it destroys them or the planet (not sure which). However, the sphere 'guarding' the earth/solar-system is malfunctioning. When the humans stumble up on this sphere they start to investigate it.
Does anyone know the name of the novel?
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