An alien civilization could shift six or seven planets into a series of carefully-arranged orbits as a signpost advertising its presence. To spot it, we just have to think mathematically. Besides ...
It was a bittersweet week for the folks at Pasadena's Jet Propulsion Lab. One one hand, their $3.4 billion Saturn orbiter plunged to its mechanical demise in the suffocating atmosphere of the planet ...
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