How can we explain the presence of extrasolar planetary systems with Jovian-sized planets at distances at which we normally find terrestrial planets?

Question

Quizplus · Accepted Answer

The best explanation for the presence of Jovian-sized planets at distances normally associated with terrestrial planets is that they formed farther out and then migrated inward. This theory is supported by both observational and theoretical evidence. Observations show that many of these planets have highly elliptical orbits or are in resonance with other planets in the system, which is consistent with the migration hypothesis. Additionally, computer simulations of planetary formation suggest that giant planets are more likely to form farther out in the protoplanetary disk, where there is more material available to build them up. Once formed, they can migrate inward due to gravitational interactions with the disk or with other planets.

How Can We Explain the Presence of Extrasolar Planetary Systems