As a result, the core's outer molten metal is slowly solidifying.

结果，核心的外部熔融金属慢慢凝固。

What makes Psyche so special is that it appears to have been a planetesimal well on its way to becoming a planet, with a rocky exterior surrounding a metal core.

Psyche 之所以如此特别，是因为它似乎是一颗正在成为行星的微行星，其岩石外壳围绕着金属核心。