A coreless planet is a theoretical type of terrestrial planet that has undergone planetary differentiation, but has no metallic core. Despite the name, this type of planet is not the same as a hollow Earth.
Origin[]
In 2008, according to Sara Seager and Linda Elkins-Tanton,there are 2 possible ways where a corless planet may form.
In the first theory,the planet acreets from chondrite-like oxidized water-rich material.
Characteristics[]
A fully silicate coreless planet will not have a molten core and therefor, no magnetic field. The predicted sizes of coreless planets and cored planets are similar, which makes it difficult to interpret the interior composition of exoplanets based on measured planetary masses and radii.