Jupiter doesn't shield Earth from comet impacts

​New York: The widely reported "Jupiter as shield" concept, implying that the planet shields Earth from comet impacts, is incorrect, says a new study.

Not only is the "Jupiter as shield" concept not true but perhaps Jupiter's most important role in fostering the development of life on Earth was just the opposite delivering the volatile materials from the outer Solar System needed for life to form, the researchers said.

In the study, Kevin Grazier from NASA Jet Propulsion Laboratory in Pasadena, California, simulated the evolution of tens of thousands of particles in the gaps between the jovian planets-- Jupiter, Saturn, Uranus, and Neptune for up to 100 million years.

Based on the results, Grazier concluded that the widely reported shield role attributed to Jupiter is incorrect. The study showed that Jupiter teams with Saturn to kick a significant fraction of the particles into the inner Solar System and into orbits that cross Earth's path.

He proposes that a Solar System with one or more planets similar to Jupiter located beyond the region of potential terrestrial planets is beneficial for the development of life.