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It has long been thought that the presence of a giant planet is apre-requisite for the development of life on potentially habitable planets.Without Jupiter, it was argued, the Earth would have been subject to apunishing impact regime, which would have significantly retarded or outrightprevented the development of life on our planet.  Although this idea is widely embraced, little research has previously beencarried out to support it. Here, we present the results of several suites ofdynamical integrations used to model the influence of Jupiter's mass and orbiton the impact rate that would be experienced by the Earth. We find that, farfrom being a simple shield, Jupiter's role in determining the terrestrialimpact flux is significantly more complicated than previously thought. Far frombeing a simple friend, such giant planets are perhaps more likely to imperilthe development of life on otherwise habitable planets.

Quantifying Jupiter's influence on the Earth's impact flux: Implications for planetary habitability