Light Metal Life
The astronomers were surprised to find planets in such a system, because heavy elements are needed to assist core accretion in this model of planet formation. The alternative model suggests that instabilities cause a breakup of the disc, but the mechanism for this is unclear. "Having this process happen to form not just one, but two, planets around a star that had so little solid material available for planet-building is quite remarkable," Cochran said. This appears to be yet another confirmation of one of Louise Riofrio's predictions. Small dark matter objects may aid core accretion without the need for heavy elements.