How an exoplanet odd couple survived by traveling in from the cold together

A remote hot Jupiter exoplanet has foregone the typical solitary life that worlds of its kind normally lead, in favor of companionship with another planet — and now, astronomers think they know why. Hot Jupiter s are gas giants that orbit exceedingly close to their star. However, they don't form that close, but are rather assembled much farther out before migrating inward. …