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Gravity's role is to keep the planets in orbit and balance.
Report Abuse. The Largest object in the Solar System would be The Sun. The Sun is About 870,000 Miles in Diameter. The Sun can fit the Hole Solar System inside itself. The Largest Planet in the Solar System is Jupiter.eport Abuse. The Largest object in the Solar System would be The Sun. The Sun is About 870,000 Miles in Diameter. The Sun can fit the Hole Solar System inside itself. The Largest Planet in the Solar System is Jupiter.