You don't need us to tell you that Jupiter, which has more than twice the mass of all the other planets in the Solar System combined, is the biggest game in town (that isn't called the Sun). But believe it or not, it may have once been even bigger. Try more than double its current size big, according to new research from Caltech — boasting enough volume to fit 2,000 Earths inside it with room to spare. Over time, the bloated world cooled off, contracting to the humbler size it is today. The findings, published in a new study in […]