David Pescovitz: The Guardian reports that the old Pioneer 10 and 11 probes are being subtly tugged around by mysterious forces as they hurtle beyond our solar system.
"Some researchers say unseen 'dark matter' may permeate the universe and that this is affecting the Pioneers' passage. Others say flaws in our understanding of the laws of gravity best explain the crafts' wayward behaviour."
And still others suggest that the probes' weird trajectories may just be the result of gas leaking from the fuel tanks.
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